How to PASS the MATH 1 EOC using DESMOS! (NC Math 1 Released EOC Desmos Hacks)

Video Statistics and Information

Video
Captions Word Cloud
Reddit Comments
Captions
hey everybody this video is to teach you how to pass the North Carolina math 1 EOC using Desmos calculator so I'm going to focus on the calculator active section and I'm going to see if I can teach you all of the Desmos hacks for passing the math 1 EOC in just about 10 minutes all right so the first hack I'm going to teach you is when you have a data set and so let see if it'll let me copy paste go into most and type stats you can do a bracket and then a parentheses and I might have gotten those mixed up I did so if I get a caution sign I'm just going to delete the bracket and it still didn't work so I'm going to put the bracket on the inside so just play around with it until you get it but the bracket goes on the inside you've got your five number summary here I've got my Min minimum q1 median Q3 and maximum and then I can take this same list and I can find the mean because I think I needed the mean for this question so I've got all the data that I need and it says which statement is true if a 10th data point of 45 is added to the data set and we want to know what's going to happen to the mean and the median so if I've got my original set here and I can even I don't even need this whole this whole list I really just needed the median so I'm going to change that paste it in and then I'm going to do it again so I'm going to find my new mean and I'm going to add in the next data point which was 45 and then I'm going to find my new median and I'm going to add in my new data set of 40 data point of 45 and I can see that my mean went up and my median stayed the same and so then I would choose C all right number 19 is another great question for me to show you how to solve this without knowing any about solving equations anytime you have an equation and you're solving for x you just need to do y equals the left and y equals the right in Desmos so I'm going to type in the y equals the left side of the equation into line one so let me clear out y equals that was the left side of the equation again this is number 19 from the release exam the right side of the equation is 10x + 4 I've typed it in left side then I did y equals the right side and I'm going to find their point of intersection the x value would be the answer so the answer to that question is one I solved it without using any algebra I'm going to hop to number 20 and this is a drag and drop question it's systems of equations systems mean we have two or two or more equations in math one we typically only have two and all I'm going to do for this question is is type these equations into Desmos and see what they look like so the first one was 2x + 2 y is equal to 16 the second equation was 4x + 3 Y is equal to 27 and when I look they intersect that means they have one solution all right then I'm going to change my equations this is the I'm going to go back and do these these middle equations so I would have dragged my um one solution here so now I'm working on these two so I've got 2x + 2 y = 8 and then I have 4x + 4 y this time is equals 16 this time they're exactly the same line the green and purple if I click back and forth between the lines they fully intersect that means there's infinitely many solution so I would drag infinitely many to that box all right now I'm going to that would mean that my last one would be no solution if you wanted to type it in to check it you're going to see that they will not intersect at all because they are parallel and you can see they don't cross so they're parallel so that would be no solution all right number 21 is one of the hardest questions on the release EOC in my mind um because it requires a lot of steps but not if you use the calculator it says which equation represents the line that is perpendicular to the graph of this equation and passes through this point so I'm going to type that equation into line one of Desmos now you do have to know a little bit of math here you have to know what perpendicular means which means it crosses at a right angle um but if as long as you know that it's going to intersect and go through that point you can just put your answer choices in so I put the first equation in and the point in and then in line three I'm going to test out the answer choices so this was answer Choice a from number 21 so 3x - 4 y = 8 and it does go through that point and so I and it looks perpendicular so right now I'm thinking a might be the answer but I'm going to just double check my other answers so I have 3x + 4 Y is equal to postive 18 that is definitely not perpendicular and it doesn't go through that point so I could eliminate that one then answer Choice C was 3x - 4 Y and it's equal to -6 does not go through the point the last answer Choice was posi 6 and positive 4 y it does go through the point and it does intersect but it clearly does not intersect at a right angle and so then my answer would be a a lot of time saved there by not doing algebra and just typing it into the C calculator all right so the next one that I'm going to go through is number 28 number 28 we travel down there and I'll link this released exam in the video comments or in the description 28 has a function a subn is equal to 3 n minus 7 guess what you can type this into the calculator exactly the way it is written and it'll graph it for you and it says um it represents the value of the nth term of a sequence what is the sum of the first and the fifth ones because this is so cool watch the sum of the first one a sub one plus a sub five gives me the answer it's all I had to do so cool you just got to do a sub1 a of 5 so feels G of X or whatever the function was that's all you do it's so cool all right so number number 35 we're going to solve a quadratic equation and when I get to 35 I see this quadratic equation it looks terrifying we learn how to do this by factoring in class um but you don't have to do it you don't have to do that you can just do y equals the left and y equals the right because that is how we solve equations in the calculator you're basically turning it into a system but y equals the left side of the equation I did y equals the right side of the equation guess what I'm going to go see where they cross now they're going to cross at 121 because that's what I set the other one to be equal to I'm G to zoom out I'm going to zoom back in make sure I've got a good view you don't want to accidentally click the Y intercept I've got one and 12 use the X values when you're doing the y equals the left y equals the right trick one and 12 are my answers and so that would be D all right number 39 moving right along we have a system we kind of already talked about how to find um a system it's just type on both in and see where they intersect so I've got F ofx you can type this in exactly I think it was 3x + 7 then I'm going to go down here and do G of X and that's 2x + 12 and I'm going to go home button gets me back zoomed out regular click where they intersect it wants the x value the x value is five another problem solved all right moving to 41 41's another one of these functions that you can just paste well I don't know if it lets you paste on the EOC but um you can just type it in it'll be on your screen you can stretch it so that you can still see the problem it's asking us for G of 30 I literally just go into the next line and do G of 30 and voila my answer arrives so cool all right so that's another problem solve number 46 I saved the lengthier type of problem for the end and Guys these are all over this test so this question is got a table and it's asking us um to use the linear best fit model if we want line of best fit or really any linear equation at all on this exam we can use the line of best fit stuff in Desmos to do it so this is what we do you go to Desmos you hit plus sign you hit table you start typing it in this is going to take me just a second but it's worth the time for how much the calculator can do for us and I've got it on my other screen so I don't have to flip back let's see 80 142 again this is number 46 we got 84 14 6 it was 86 148 and then 88 and 152 the important thing here is to take a second and make sure you typed in the right numbers because if you type it in the calculator wrong it's going to be wrong all right all right and I think I've checked them what you're going to do in line two is you're going to do y1 squiggle Mark a X1 plus b this equation a is your slope B is your Y intercept so now I can do the equation of my line because I have the slope and I have the Y intercept I'm going to write it like we normally write it yal MX plus b the 1 Point 04 I'm just going to round I don't even need to do the most accurate number I'm just going to do two decimal places why not 84 I think that'll get me there once I'm here you've got some options said to use the line of best fit to predict the running heart rate of a girl who is whose walking heart rate is 100 so I'm going to look at my table and see if 100 is X or Y the left side of my table was walking heart rate so that means it's X so I need to plug in 100 to my um equation you can hit the settings wheel button in the table and you can type in 100 and it gives me the answer that's one way I could find the answer gave me about 162 8 that rounds to 163 the answer is B the other way I could do this is simply by not even using that table I could just go to the X and type in 100 and that also gives me the answer so This Is How We Do line of best fit something else I want to point out about my line of best fit equation the R value tells me if the correlation is strong or not we have a very strong correlation here because it's close to one if it was close to negative one that would be a strong negative correlation um or relationship if it's close to zero it's a weak relationship if you hit this magnifying button magnifying glass button it makes all the points show up and it shows you the line all those points are very close to the line and so we can see that it's a good fit model so they might ask you is it a good fit model they might ask you about a residual plot and a residual plot is made by the point how far the points are from the line so they can like which of these points needs to be removed and you'd pick the one that was the furthest distance from the line so that's just a little bit about line of best fit there's tons of questions on this exam released exam where you're using that you could do the same thing for number 45 um all right so I want to show you this one this is our last one I think I've gone over my 10 minutes but it says what is the distance between the Y intercept of this function and the Y intercept of the table and it tells me that the table is a linear function okay so I'm going to go back to Desmos I'm going to click this table and I'm going to type in that linear function that it had on this on the screen 515 -23 23 and 5 -25 then I go here I do y1 squiggle Mark ax1 + B and I hit the magnifying glass it zooms me to My Line This is actually exact linear model that's why the R value is negative one because it's a perfect negative sloping line the B value is the Y intercept all right I'm going to go down here I'm going to type in the other function it gave me f ofx = 2X sared and then it was - 6 x + 3 and I look there that's that Y intercept this one's at5 it says what is the distance between them well to get from 3 to5 we would have to travel eight but there's a lot of ways you can use this linear regression feature to get equations of lines to get slope I think there's a question after this that just says um where did it go what is the slope of the of the line that fits the data you would do the same thing but you would want the slope which is the a value in the calculator I hope this video helps you rock the math 1 EOC use your strategies when in doubt Desmos your heart out just type it go back to the ones you flag and just try to use Desmos to get them done and I hope that you'll be successful I know that you will have a great day
Info
Channel: Math n Cheese
Views: 1,252
Rating: undefined out of 5
Keywords: Math 1 EOC, pass math 1, NC Math 1, Desmos Hacks, Desmos, graphing calculator
Id: ZsEX0O8evs4
Channel Id: undefined
Length: 15min 1sec (901 seconds)
Published: Wed May 15 2024
Related Videos
Note
Please note that this website is currently a work in progress! Lots of interesting data and statistics to come.