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y-x=-4
y= -4+x
x+2(-4+x)=1
x+-8+2x=1
3x=9
x=3
x= -2y+1
y - ( -2y+1)= -4
y+2y-1= -4
3y= -3
y= -1
gabungan; (x+2y=1) x1= x+2y=1
(y-x= -4) x2=2y-2x= -8
3x=9
x=3
y-1(3)= -4 spldv= (3,-1)
y-3= -4
y= -1