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3x+2yy=12
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x+4y=14
3x+2y=12
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x+4y=14
(-2).3x+(-2).2y=(-2).12
----------------------
x+4y=14
(-6)x+(-4)y=-24
HASIL = (5)x=14+(-24)
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x+4y=14
(-5)x=14-24
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x+4y=14
(-5)x=-10
x+4y=14
x=-10/-5
x=2
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x+4y=14
2+4y=14
4y=14-2
4y=12
y=12/4
y= 3