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f(-1)= 2
f(1)= 8
f(-1)= a(-1) + b= 2 ---> -a + b= 2
f(1)= a(1) + b= 8 ---> a + b= 8 _
-2a= -6
a= -6/-2
a= 3
a + b= 8
3 + b= 8
b= 8 - 3
b= 5
Jadi :
a= 3
b= 5
Maka, bentuk fungsinya adalah :
f(x)= ax + b
f(x)= 3x + 5