Question

3x+3y+1=x+4y
7-2x+2y=x-8y

Answer 1

3x+3y+1=x+4y
3x-x+3y-4y=-1
2x=y-1
x=1/2y-1/2

7-2x+2y=x-8y
-2x-x=-8y-7-2y
-3x=-10y-7
x=10/3y+7/3