-3y + y = -2y
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Well, honey, y plus y plus y is just 3y. It's as simple as that. No need to overcomplicate things, darling.
4x + 3y = 8x + y so 3y - y = 8x - 4x ie 2y = 4x so y = 2x
5x+2x-3y+y = (5+2)x+(-3+1)y = 7x - 2y
OK, so-3y + 15 - y = 39-3y + 15 - 15 - y = 39 - 15-3y -y = 24-4y = 24-y = 6y= -6.Hope this helps!
y = 8