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3x-y=15
x+3y=3
Delta = |3 -1| = (3.3)-(-1.1)=9+1=10
|1 3|
Delta X = |15 -1|=(15.3)-(-1.3)=45+3=48
| 3 3|
Delta Y = |3 15| = (3.3)-(15.1)=9-15=-6
|1 3|
X= Delta X / Delta = 48/10 = 4,8
Y= Delta Y/ Delta = -6/10=-0,6
maka x-2y=
4,8-(2(-0,6))=4,8+1,2=6