Explanation for Question 18 From the Math (No Calc) Section on the 2018 March Sat
Question 18 asks for a function F F of negative one is equal to 2 12 and F of one is equal to 16. 3 If the graph of Y equals F of X is align in the X, 4 Y plane, what is the slope of the line? So I've gone ahead and 5 I've written out the slope formula. That's Y two minus Y one over X, 6 two minus X one, which basically states that if we know two coordinates of 7 line, we can plug the values in, 8 into this equation and that'll help us find the slope. 9 And we do have two coordinates. We know that when X is equal to 10 negative one, Y is equal to 12. 11 That's our first coordinate and that when F is equal to, 12 or when X is equal to one, Y is equal to 16. 13 So now we can plug these values in. So Y two is 16 minus 14 Y one, which is 12 over X, 15 two, one minus X one, 16 which is negative ones. That's just plus one. 17 And that gives us four over two or two as 18 the slope of this.