Please help. I'm math retarded. These are some math questions I can't figure out.

You purchase an SUV for $26,000. A year later, the car is worth only $24,800.If the value of the car continues to depreciate at that rate,

A) find the linear equation that determines the value of the car based on the number of years you own it.

B) when will the car be worth $500?

thanks for any help