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x-3y= -7
Dengan x=a dan y=b
Ditanya : 4a-3b
Jawab :
2x+3y=4
x-3y = -7
-------------- -
3x = -3
x = -3/3
x = -1
2x+3y=4
2(-1)+3y=4
(-2)+3y=4
3y=4+2
3y=6
y=6/3
y=2
Ditanya
4a-3b
x=a dan y=b
4(-1)-3.2
(-4)-6
=-10 (A)
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