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b. 2x-y=3
=>eliminasi a×1 b×2
4x+3y=20
4x-2y=6
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5y=14
y=14/5
y=2,8
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2,8 substitusi ke persamaan 4x-2y=6
=> 4x-2(2,8)
=> 4x-5,2=6
=> 4x=11,2
=> x=11,2/4