6x-2y
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the answer to this problem is -2x^2y^2
4x+2y = 20 2y = -4x+20 y = -2x+10
4x + 2y = 20 2y = -4x + 20 y = -2x + 10.......but you may also write it as y = 10 - 2x.
3x + y
4x2 - 4x + 2xy - 2y = 4x(x - 1) + 2y(x - 1) = (x - 1)(4x + 2y) = 2(x - 1)(2x + y)