Question

x+2y=2x+2y=7x-4y simplify this

Answer 1

x+2y=2x+2y=7x-4y
1 2 3
from1 and 2
x+2y=2x+2y
x-2x=2y-2y
-x=0
x=0
from 1 and 3
x+2y=7x-4y
-6x+6y=0
-6(x-y)=0
x-y=0
so x=y
therefore y is also 0