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0=(3m-1)*(-3)-7
-9m+3-7=0
-9m-4=0
-9m=4
m=-4/9
x=-3
f(-3)=(3m-1)(-3)-7=0
-9m+3-7=0
-9m=4
m=-4/9
Miejsce zerowe x=-3 zatem y=0 podstawiamy parametry punktu do funkcji:
0=(3m-1)*(-3)-7
0= -9m+3-7
9m=-4/:9
m=-4/9
zatem
f(x)=(3*(-4/9)-1)x-7=(-4/3-1)x-7= -7/3x-7