math help please
posted by Taylor .
the amount of revenue brought in by states from motor vehicle licenses increased at a relatively constant rate of 499.79 million dollars per year from 1990 to 2000. In 2000, the states brought in 15,099 million dollars in revenue from motor vehicle licenses.
a: what was the approximate revenue from licenses in 1990?
b: write an equation that gives the revenue as a function of the number of years since 1990.
c: find the revenue from licenses in 1999.

math help please 
Kuai
a. y = mx + b
15099 = 499.79(10) + b
b = 10101.1
y = 499.79x + 10101.1
b. y = 499.97x + 10101.1
y = 499.79(0) + 10101. 1
y = $10101.1
c. y = 499.79x + 10101.1
y = 499.79(9) + 10101.1
y = $14599.21
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