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2x+y=1
x-2y=8
2x+ y=1x-2y=8 //*-2 2x+ y=1 -2x+4y=-16 5y = -15 y = -3 x-2y=8 x = 2y + 8 = -6 + 8 = 2 y=-3
x=2
y=1-2x
x+2y=8
x+2*(1-2x)=8
x+2-4x=8
-3x+2=8
-3x=8-6
-3x=6|:(-3)
x=-2
2*(-2)+y=1
-4+y=1|+4
y=1+4
y=5
spr.
2*-2+5=1
-4+5=1 (ok)
-2-2*5=8
-2-10=8 (ok)
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2x+ y=1
x-2y=8 //*-2
2x+ y=1
-2x+4y=-16
5y = -15
y = -3
x-2y=8
x = 2y + 8 = -6 + 8 = 2
y=-3
x=2
2x+y=1
y=1-2x
x+2y=8
x+2*(1-2x)=8
x+2-4x=8
-3x+2=8
-3x=8-6
-3x=6|:(-3)
x=-2
2x+y=1
2*(-2)+y=1
-4+y=1|+4
y=1+4
y=5
y=5
x=-2
spr.
2*-2+5=1
-4+5=1 (ok)
x-2y=8
-2-2*5=8
-2-10=8 (ok)