Explanation for Question 19 From the Math (Calc) Section on the 2017 May Sat
Questions 19 and 20 are related. So let's first take a look at question 2 19 question. 19 first gives us a equation 3 which is in Y equals MX plus B form. 4 It's a little bit backwards, but the important thing to know is that the 5 am is the number. Um, that's always in front of the variable. 6 So the coefficient of the variable, and it's going to be our slope and 7 our y-intercept is always the integer, which is going to be here 2,565. 8 So let's read the paragraph and then let's read the question to see what 9 they're asking for. The paragraph says an airplane flies directly 10 from a city in Pennsylvania, to a city in Ecuador, 11 the equation above estimates, the distance D in miles from the city and Ecuador 12 of the airplane, TRS after taking off from the city in Pennsylvania, 13 which of the following is the best interpretation of the number of 2,565 14 in this context. 15 So we just say before that this number is our Y intercept. 16 Um, obviously in a real real case scenario, 17 we're going to be interpreting the winds. That's a little differently than when we 18 have a line and X, Y plane, but it is very similar. 19 So when we have a line or Y intercept is when the line crosses 20 the Y axis and that's going to happen at X equals zero. 21 In this case, our X is our T and that's going to be an 22 hours. So it's our time. 23 Um, and when we have time of zero, 24 that's at the beginning of the story, or beginning of the time here in 25 this real world, we're okay. Scenar...