9
practice testMultiple Choice

Practice Test

Question 9 • Mathematics I

Raphael graphed the functions g of x is equal to x plus 2 and f of x is equal to x minus 1 . How many units below the y -intercept of g of x is the y -intercept of f of x ? Open image in full-screen view

Answer
A
negative 1 units
B
negative 3 units
C
2 units
D
3 units

Explanation

The y-intercept is the value of the function when x = 0. For g(x) = x + 2, the y-intercept is 2; for f(x) = x − 1, it is −1. The difference is 2 − (−1) = 3, so f’s y-intercept is 3 units below g’s.

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