a) x-y=3
2x-y=4
b) x-y=4
-2x=3y=1
c) x-y=3
4x=2x=0
pilneee!!
a)
x-y=3|*(-2)
-2x+2y=-6
2y-y=-6+4
y=-2
2x-2=4
2x=4+2
2x=6|:2
x=3
b)
x-y=4|*2
-2x+3y=1
2x-2y=8
-2y+3y=8+1
y=9
-2x+3*9=1
-2x+27=1
-2x=1+27
-2x=28|:(-2)
x=-14
c)
x-y=|*2
4x+2y=0
2x-2y=3
2x+4x=3
6x=3|:6
x=-2
4*(-2)+2y=0
-8+2y=0
2y=0+8
2y=8|:2
y=4
;) ;) ;)
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a)
x-y=3|*(-2)
2x-y=4
-2x+2y=-6
2x-y=4
2y-y=-6+4
y=-2
2x-y=4
2x-2=4
2x=4+2
2x=6|:2
x=3
y=-2
b)
x-y=4|*2
-2x+3y=1
2x-2y=8
-2x+3y=1
-2y+3y=8+1
y=9
-2x+3y=1
-2x+3*9=1
-2x+27=1
-2x=1+27
-2x=28|:(-2)
x=-14
y=9
c)
x-y=|*2
4x+2y=0
2x-2y=3
4x+2y=0
2x+4x=3
6x=3|:6
x=-2
4x+2y=0
4*(-2)+2y=0
-8+2y=0
2y=0+8
2y=8|:2
y=4
x=-2
;) ;) ;)