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a)x+y=5
-x+y=-5
x+y=5
x-y=5
x+y=3
x-y=5
x+y=3
-x+y=-5
b)
-x+y=-5
x-y=5
c)x+y=5
x+y=3
6
a)
x+3y=4
1/3x+y=serce /*3
3*serce=4
serce=4/3
b)
6x+2y=1 /*1,5
9x+3y=karo
1,5=karo
c)
2(x+1)-y=5
2(y-x)-2x=pik
2x+2-y=5
2y-2x-2x=pik
2x-y=3 /*(-2)
2y-4x=pik
pik=-6