Answer:
fries are $2 onion rings $3
Explanation:
say fries are y and onion rings are X we get two simultaneous equations
y+x= 5 and 3y+2x=12
equal either X or y, I will do x
2y+2x=10 and 3y+2x=12
take the first equation fromm the second
y=2
them sub y into one of the original equations to solve X,
y+x=5
2+X=5
x=3