2x-8(x+y)=y-x

Answer 1

times everything in parenthesis by 8

giving you

2x - 8x - 8y = y - x combine like terms

-6x - 8y = y - x

add x to both side

-5x - 8y= y

-y from both side

-5x -9y=0

Answer 2

and it depends on which variable you want but im sure you can figure it out from here