Explanation for Question 2 From the Math (Calc) Section on the 2019 May Sat
So question two asks if Y equals X squared plus X plus 2 a, where a is a constant and Y equals 11, 3 when X equals Y what is the value of a, 4 so with these types of problems, it's tying us than that. 5 When Y equals a certain value, X equals a certain value. 6 So since we know that information, we can plug in the Y value that 7 we're given, which is 11 and the X value that we're given, 8 which is one, and then we can solve backwards to find day. 9 So let's start by plugging those numbers in. 10 So we have 11 is equal to one square plus 11 one times a plus, 12 okay. And this just equals 11 equals one. 13 Plus a plus, 14 then we can add like terms. So that gives us 11 equals one, 15 plus two a, I just added together the two A's and 16 then I can subtract one from both sides, 17 which gives us 10 is equal to two a and finally 18 you can divide both sides by two. So that gives us five 19 is equal to a, and so the answer here is D.