Question 76542
SINCE YOU HAVE 2 GAL. OF REGULAR THAT MEANS YOU HAVE 8 GAL. OF PREMIUM GAS.
LET X BE THE PRICE OF THE PREMIUM GAS & (X-.12) THE PRICE FOR THE REGULAR GAS.
13.56=8*X+2(X-.12)
13.56=8X+2X-.24
13.56=10X-.24
10X=13.56+.24
10X=13.80
X=13.80/10
X=1.38 FOR THE PREMIUM GAS
1.38-.12=1.26 FOR THE REGULAR GAS
PROOF
8*1.38+2*1.26=13.56
11.04+2.52=13.56
13.56=13.56