math
posted by sophia
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).

Steve
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.
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