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2x-y=-3
eliminasi x, pada pers ke dua d kali 2
4x-3y=1
4x-2y=-6
=> 0-y=7
y=-7
dan
subtitusi ke pers 2
2*x-y=-3
2x-(-7)=-3
2x=-3-7
2x=-10
x=5
nilai x=5 dan y= -7
jadi nilai -4x + 3y= -4(5)+3(-7)= -20 -21= -41