The value of a car decreases at a constant rate as it grows older. When the car is 2 years old, it is worth $23,000. When the car is 5 years old it is worth $15,500.

Question

Write and equation relating y (value of the car $) to x (age of car).

Answer 1

this is just like the other one. The car dropped in value by $7500 in 5 years.

That is $1500/year, so the slope of the line

y = mx+b is -1500

That means

y = -1500x + b

Now you just have to find b so it fits the data.