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2p - q = -18, maka q = 2p + 18.... persamaan 2
substitusi persamaan 2 ke persamaan 1
3p + 4q = -16
3p + 4(2p + 18) = -16
3p + 8p + 72 = -16
11p = -16 - 72
11p = -88
p = -8
substitusi p = -8 ke persamaan 2
q = 2p + 18
q = 2(-8) + 18
q = -16 + 18
q = 2
nilai p + q = -8 + 2 = -6