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m.z. x=-6
y=ax+b
y=ax-2
-6a-2=0
-6a=2
a= -1/3
Odp. y= -1/3 x-2.
y=ax-2
Do wykresu należy również punkt (-6,0) i a>0:
0=a*-6-2
-6a=2
a=-1/3
y=-1/3 a -2