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x - 3y = 12 | x 3 | 3x - 9y = 36
Keduanya dikurangi hasilnya ~> 14y = -28, maka y = -2
Substitusi ke persamaan x - 3y = 12
x - 3(-2) = 12
x + 6 = 12
x = 6
2x + 3y = 2(6) + 3(-2)
2x + 3y = 12 - 6
2x + 3y = 6
15. x - 4 - 3x + 1 ≥ 7
-2x - 3 ≥ 7
-2x ≥ 10
x ≥ -5