Question 1155672
5H+2C=23.65
3H+1C=13.80
-6H-2C=-27.60, multiplying the bottom equation by -2.  Add them.
-H=-3.95
Hamburgers at $3.95

so 3 are 11.85 and 1 C has to be $1.95 to add to $13.80
Cheese is $1.95 ANSWER

Check in the top
$19.75+$3.90=$23.65 checks.