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-x+3y=11
y=-3-3x
-x+3(-3-3x)=11
y=-3-3x
-x-9-9x=11
y=-3-3x
-10x=20
y=-3-3*(-2)
x=-2
y=-3+6
x=-2
y=3
x=-2
b)x-y+2=0
2y=x+6
x=0-2+y
2y=x+6
x=-2+y
2y=-2+y+6
x=-2+y
2y=4+y
x=-2+y
2y-y=4
x=-2+4
y=4
x=2
y=4
c)3x-2=2y
y-6x=-2.5
3x-2=2y
y=-2.5+6x
3x-2=2(-2.5+6x)
y=-2.5+6x
3x-2=-5+12x
y=-2,5+6x
3x-12x=-5+2
y=-2.5+6x
-9x=-3
y=-2.5+6x
x=1/3(w ułamku:jedna trzecia)
y=-2.5+6*1/3
x=1/3
y=-2.5+2
x=1/3
y=-0.5
-x=11-3/*-1
3x-y=-3
x=11+3
3x-y=-3
x=14
3*14-y=-3
x=14
42-y=-3
x=14
-y=-3-42/*-1
x=14
y=45
b)x-y+2=0
2y=x+6
x=-2+y
2y=x+6
x=-2+y
2y=-2+y
x=-2+y
2y-y=-2
y=-2
x=-2+-2
y=-2
x=-4
c)3x-2=2y
y-6x=5/2
3x-2=2y
y=6x+5/2
3x-2=2*(6x+5/2)
y=6x+5/2
3x-2=12x+5
y=6x+2.5
3x-12x=5+2
y=6x+2.5
-9x=7/:-9
y=6x+2.5
x=-7/9
y=6*-7/9+2.5
x=-7/9
y=4 i 2/3+2.5
x=-7/9
y=7 i 1/6
mysle ze pomoglam ;)*
-x+3y=11
y=-3-3x
-x+3(-3-3x)=-x-9-9x
-10x=-9/-10
x=9/10
y=3-3(9/10)
y=3-27/10
y=3/10
x-y+2=0
2y=x+6
x=-6+2y
-6+2y-y+2=0
y=-2+6=4
x=6+2*4=14
3x-2=2y
y-6x=-5/2
y=-5/2+6x
3x-2=2(-5/2+6x)
3x-2=-5+12x
3x-12x=-5+2/(-9)
x=7/2=3½
y=-5/2+6*7/2=-5/2+21=18½