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-x - 3y =5
y = -2x
-x-3*(-2x)=5
y= -2x
-x+6x=5
y= -2x
5x=5/:5
y= -2x
x=1
y= -2*1
x=1
y= -2
spr.
-x-3y=5
-1-3*(-2)=5
-1+6=5
5=5
L=P
f)
4x - y = 6
y = x
4x-x=6
y=x
3x=6/:3
y=x
x=2
y=2
spr
4x-y=6
4*2-2=6
8-2=6
6=6
L=P