Explanation for Question 7 From the Math (No Calc) Section on the 2017 April Sat
Question seven says the solution to the system of equations above is X, 2 Y what is the value of X? 3 So I'm going to start by multiplying this equation on the bottle by two, 4 and then setting these up on top of each other. So X plus two, 5 Y is equal to 16. And then I'm going to just multiply this by 6 two to get X plus negative two, 7 Y is equal to 20. 8 Then I'm going to add these two equations together. 9 X plus X is two X, two Y plus negative two. 10 Y is zero and that's set equal to 16 plus 20, 11 which is 36. And then finally, 12 I'm going to divide both sides by two to get X is equal to 13 18, which is answer choice C.