Answer:
Step-by-step explanation:
Let price of milgrade gas be x and price of lawnmower gas be y.
18x + 5y=59.51
14x+y=39.75
Isolate one variable and substitute to solve for other variable.
(a) 1,1 (b) 3,2 (c) 3,2 (d) 1,5
If you times 39.99 by 0.20 (20%) then you get your answer of $7.99
