Suppose your car is 40 months old. Its trade in value is $3200. Its trade in value 10 months ago was $4700. Write out a function if this decrease stays constant

Question

I need to find just the linear function. y= mx +b. Thanks!

Answer 1

Sophia, m, or the slope, is the change in y over the change in x. In ten months, the value went down.

 

(3200 - 4700)/10 = -150

 

Since we are decreasing from 4700, this will be our y-intercept, considering we have no information on the car being older than 10 months.

 

y = -150x + 4700

 

Hope this helps!