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y=ax+b
2a+b=1
-3a+b=2
----------- _
5a=-1
a=-1/5
2*(-1/5)+b=1
b=1+2/5
b=7/5
Odp. y=-1/5 x+7/5
2.
2x+y+4=0
y=-2x-4
-1/2 x+y+1=0
y=1/2 x-1
a1≠a2
Proste nie sa rownolegle. (sa prostopadle, bo -2*1/2=-1)