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