Question 1107682
sol:
let pineapple topping= x
and strawberry topping=y 
then system of equation be
       8x+3y=22      equ:1
       4x+7y=22      equ:2
multiply equation 2 by 2 and then subtract it from equ:1
     1( 8x+3y=22)=>  8x+3y=22
     2(4x+7y=22)=>   8x+14y=44
                     -  -   -
       -11y=-22
          y=2
put y=2 in equ 1
        8x+3(2)=22
        8x+6=22
        8x=22-6
        8x=16
        x=2
pineapple topping cost is 2$ and strawberry topping is 2$.