Question

Cherokee Just filled both of the family vehicles at a service station. The total cost for 20 gal of regular unleaded and 17 gal of premium unleaded was $144.89. The premium gas was $0.10 more per gallon than the regular gas. Find the price per gallon for each type of gasoline.

Answer 1

r = regular unleaded
p = premium unleaded

20r + 17p = 144.89
p = .10 + r

sub .10 + r in for p in the 1st equation...solve for r.
Once r is found, sub it in the 2nd equation and solve for p.
Once you know the known variables, you can sub them both in the 1st equation to check your answer. Now lets see what you can do...