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a1*a2=-1
-2a=-1
a=1/2
y=1/2 x +b
1/2 * 3+b=0
b=-1,5
y=0,5x-1,5
y=-2x+1
-2x+1=0,5x-1,5
-2,5x=-2,5
x=1
y=0,5-1,5=-1
S=(1,-1)
A=(x,y)
1/2*(x+3)=1
x+3=2
x=2-3=-1
1/2*(-1+y)=0
y=1
Odp. A=(-1,1)