Question 1073390
Let b be burgers and f be fries. Then:
6b+5f=68
4b+7f=75
So:
42b+35f=476
20b+35f=375
22b=476-375=101
b=$4.59
f=$8.09  
Burgers are $4.59 each; and fries are $8.09 each. ☺☺☺☺