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y+2-3+x=0
x-2=5-2+y
x+y=1 /×(-1)
x-y=5
-x-y=-1
x-y=5
-2y=4
y=-2
x-2=1
x=3
spr. 3-2=1
1=1
3+2=5
5=5
zad.2]
=3x-3y+4x=8
3x-15y=5-9y
7x-3y=8 /×(-2)
3x-6y=5
-14x+6y=-16
3x-6y=5
-11x=-11
x=1
3-6y=5
-6y=2
y=-⅓
spr.7-3×(-⅓)=7+1=8
8=8