Question

-x + 2y + 8x - 5y + (-6x) - -4y

Answer 1

-x + 8x - 6x = x
2y-5y+4y= y

Answer 2

thanks:)

Answer 3

-x +2y +8x -5y +(-6x) --4y

First, +(-6x) = -6x, and --4y = +4y.

So that yields:

-x +2y +8x -5y -6x +4y

Now group the Xs and the Ys:

+8x -6x -x = x

+2y +4y -5y = y

so -x +2y +8x -5y +(-6x) --4y = x+y