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2x+y = 4 (kalikan 4)
3x+4y=12 (kalikan 1)
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8x+4y = 16
3x+4y = 12
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5x = 4 ⇔ x = 4/5 atau 0,8
substitusikan ke pers. 2x+y =4⇔ 2(4/5)+y= 4⇔y= 4-8/5⇔y = 12/5 atau 2,4
semoga membantu