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2x + y = 12
2x + 4y = 24
2x + y = 12 lalu dikurangi
=>3y=12
y=4
untuk daerah x,disubtitusikan..mnjdi x + 2y =12 => x + 2(4) =12 => x+8=12 => x=4
x+2y=12
x+2y=12