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2x + 2y = 18
-5x + 2y = 27 - (metode eliminasi)
7x = -9
x = -9/7
metode substitusi
subtitusikan nilai x = -9/7 ke persamaan 1
2x + 2y = 18
2.(-9/7) + 2y = 18
-18/7 + 2y = 18
-18/7 + 18/7 + 2y = 18 + 18/7
2y = 144/14
2/2 y = (144/14) / 2
y = 288/14
HP = { (x,y) | (-9/7 , 288/14) }