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Klamra
x+2y=6
x-y=3/*(-1)
Klamra
x+2y=6
-x+y=3
------------- +
3y=9/:3
y=3
x+6=6
Klamra
x=0
y=3
Tego b) nie potrafię :x
c)
Klamra
x+3y=12
2x-y=3/*3
Klamra
x+3y=12
6x-3y=9
------------- +
7x=21/:7
x=3
3+3y=12
3y=12-3
3y=9/:3
Klamra
y=3
x=3
d)
Klamra
3y+5x=0/*2
2y+3x=4/*(-3)
Klamra
6y+10x=0
-6y+-9x=-12
------------------ +
x=-12
2y-24=4
2y=24+4
2y=28/:2
Klamra
y=24
x=-12