Explanation for Question 25 From the Math (Calc) Section on the 2018 May Sat
Question 25 says the scatterplot above represents the salary. 2 Why in thousands of dollars and the number of years of experience acts for 3 each of the six employees at a company, a line of best fit is 4 also shown which of the following could be an equation of the line of 5 best fit. So to figure this out, 6 we're going to use the Y equals MX plus B formula or M represents 7 the slope and B represents the Y intercept. 8 The first thing we know is that there is a Y intercept and that 9 it's around somewhere between 45 and 49. 10 From that we can eliminate answer D which has a Y intercept of 55 11 and answer a, which has no white intercept. 12 Next, we need to figure out what the slope is cause BNC have the 13 same Y intercept, but different slopes to do that. 14 I'm just going to pick two points on the graph. 15 Uh, I'm going to pick this point right here and this point right here, 16 and I'm just gonna see what the rise over run is and keep in 17 mind that these rise by two. So don't be tricked by that. 18 So the rise is 2, 4, 6. 19 That's the numerator of our slope. And the run is 1, 2, 3, 4, 20 which tells us that our slope is six over four or simplified three over 21 two. And therefore our answer is.