Explanation for Question 19 From the Math (Calc) Section on the 2018 March Sat
Question 19 says if X one Y one and X two Y two, 2 our solutions to the system of equations above what are the values of X 3 one and X two. So since we know that Y is equal to two, 4 we can plug that into our bottom equation to make it negative. 5 Two plus 11 is equal to X squared, 6 which is equal to nine is equal to X where then 7 we can find the square root of both sides. 8 And that tells us plus, or minus three is equal to X, 9 which means that our X values. 10 So X one and X two are negative three and positive three answer choice.