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Y=1-3x
Maka 2x-y=9
2x-(1-3x)=9
2x-1+3x=9
5x=10
X=2
Maka y=1-3x
Y=1-3.2
1-6=-5
y =9-2x 3x+1(9-2x)=1
y=9-2.(dikali) -8 3x+9-2x =1
y=9+16 3x-2x+9 =1
y=25 x +9 =1
x =1-9
x =-8