Question

An object moves at a constant rate. The graph shows the object's height at different times. Which equation represents the situation?

A. y = −15x 900
b. y = −15x − 900
c. y = 15x − 900
d. y = 15x 900

Answer 1

The correct answer is
(A) y=-15x+900

Answer 2

d. y = 15x 900

Although you do not give the rates I assume the answer is D as it is the only positive multiplication. You cannot have negative height.