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5x+7y=10
[3 4] [x]=[6]
[5 7] [y]=[10]
D=|3 4|= 3.7-5.4=21-20=1
|5 7|
Dx=|6 4|=6.7-10.4=42-40=2
|10 7|
Dy=|3 6|=3.10-5.6=30-30=0
|5 10|
maka,
x=Dx/D=2/1=2 y=Dy/D=0/1=0
jadi 2x-3y=2(2)-3(0)=4-0=4