Explanation for Question 14 From the Math (No Calc) Section on the 2018 March Sat
Question 14 says and the X, 2 Y plane, the graph of the equation, Y equals nine X minus eight, 3 intersects the graph of the equation. Y equals X squared at two points. 4 What is the sum of the X coordinates of the two points? 5 So we just need to set these two equations equally equal to each other. 6 So for X, and then add together those two X values. 7 So let's start by just setting these equal to each other. 8 X squared is equal to nine X minus eight. 9 We're going to move everything to the left side of the equation. 10 So that's going to give us X squared plus negative nine X 11 plus eight is equal to zero. 12 And then when we factor that we get X minus eight times 13 X minus one is equal to zero. 14 And so we know that X is equal to eight and the X 15 is equal to one. And so to find the answer to this question, 16 we just have to add together those two values and we get X is 17 equal to nine. So the correct answer here is answer choices.