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jawab:
2x+y=6 ⇒ ×1 ⇒ 2x + y = 6
x +y =2 ⇒ ×2 ⇒ 2x+2y=4 (keda ruas dikurangkan)
⇔ -y=2
⇔ y=-2
2x+y=6 ⇒ ×2 ⇒ 4x +2y=12
x+y=2 ⇒ ×2 ⇒ 2x+2y=4 ( kedua ruas dikurangkan)
⇔2x =8
⇔x =4