Question

Mia's plant grows at an average rate of 5cm each month.

When she bought it, it was 18 cm tall.

Select the function that models the relationship between y, the height of the plant in cm, and x, the time in months that it grows.

A. y = 18x + 5

B. y = 18 + 5x

C. y = x + 18

D. y = 23x

Answer 1

B

Explanation:

The 18 is the intitial value. It does not change. What does change is the height every month. You would substitute in the number of months for x to find the height of the plant.