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2x - 9y = 24 .....(i)-3x + 4y = -17 ... (ii)
Eliminasi kedua persamaan. Untuk mencari y, pers.(i) dikali 3 dan pers
(ii) dikali 2
6x - 27y = 72
-6x + 8y = -34
___________ +
-19y = 38
y = -2
Substitusi y ke pers.(1)
2x - 9y = 24
2x - 9(-2) = 24
2x + 18 = 24
2x = 6
x = 3
3x - 3y
= 3(3) - 3(-2)
= 9 + 6
= 15