Explanation for Question 3 From the Math (No Calc) Section on the 2018 May Sat
Question three asks, which of the following equations represents the line in the X, 2 Y plane that passes through zero three and has a slope of negative three. 3 So to come up with this equation, we're going to use the Y equals 4 MX plus B formula, where you can find the equation of any line. 5 If you just know its slope. And it's Y intercept, 6 you plug in the slope for M and you plug in the Y intercept 7 for B, we're told that the slope of this line is negative three. 8 So we know that the beginning of this equation is Y equals negative 9 three X. And we also know that the Y intercept is zero three. 10 So at positive three, so B is equal to three. 11 And this equation, should you read? Y equals negative three X plus three. 12 And so we know that the correct answer here is B.