# math

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

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.

posted by Steve

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