# A used car dealer is examining how the price at which a car can be sold varies with the car's mileage. What is the independent variable in this relationship?

Dec 10, 2017

It would be the car's mileage.

#### Explanation:

The price depends on the mileage:

higher mileage = lower price

lower mileage = higher price

Looks like an inverse relationship.

I just made up this equation: $y = \left(\frac{1}{2}\right) x + 10$ to get a line with negative slope:

graph{-(1/2)x +10 [-1.35, 21.15, -0.675, 10.575]}

On this graph, the x-axis is mileage and the y-axis is price in thousands of dollars.

if the car has zero mileage, it's worth $10,000; if the car has 10,000 miles on it, it's worth$5,000: