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x+6y=-9
di eliminasi
2x-3y=12 X1
x+6y=-9 X2
jadi
2x-3y=12
2x+12y=-18
_________ -
-15y =30
y=-2------> 2x-3y =12
2x-3(-2) =12
2x=12-6
2x= 6
× =3
x+3y=
3+3(-2) =-3
maaf tolong koreksinya kalau salah