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2x = 9y + 6
x = 9/2 y + 3
Kita stubsitusikan ke -3x + 7y = -9
-3(9/2 y + 3) + 7y = -9
-27/2 y - 9 + 14/2 y = -9
-13/2 y = -9 + 9
-13/2 y = 0
y = 0
setelah itu kita stubsitusikan ke
x = 9/2 y + 3
x = 9/2 × 0 + 3
x = 3
Jadi, x = 3 dan y = 0