Question 220990
x+y=56 or x=56-y
y=2x+2
y=2(56-y)+2
y=112-2y+2
y+2y=112+2
3y=114
y=114/3
y=38 ans.
x+38=56
x=56-38
x=18 ans.
Proof:
38+18=56
56=56