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4x - y + 4 + 2x + 3y + 5 = 6x + 2y + 9
b) Q - P
2x + 3y + 5 - (4x - y + 4)
2x + 3y + 5 - 4x + y - 4 = - 2x + 4y + 1
c) 2P - Q
2(4x - y + 4) - (2x + 3y + 5)
8x - 2y + 8 - 2x - 3y - 5 = 6x - 5y + 3