Question 1170258
c = 16.99 + .87 * m
c is the total cost.
m is the number of miles.


when c = 215.35, the equation becomes 215.35 = 16.99 + .87 * m
subtract 16.99 from both sides of this equation to get 215.35 - 16.99 = .87 * m
combine like terms to get 198.36 = .87 * m
solve for m to get m = 198.36 / .87 = 228.


he drove the truck for 228 miles.
the total cost was 16.99 + .87 * 228 = 215.35.


all the numbers check out.
your solution is that he drove 228 miles.