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B. f(x) = 3x+-1
C. gatau
D.3
f(2)= (a.2) + b = 5
f(-1)= (a.(-1)) + b = -4
f(2) = 2a + b = 5
f(-1)= -1a + b = -4
__________________ _
3a = 9
a = 3
f(-1) = (-1.3) + b = -4
= -3 + b = -4
= b = -4 + 3
= b = -1
b. f(x) = 3x + (-1)
d. f(x) = 3x + (-1) = 8
= 3x = 8+1
= 3x = 9
= x = 3
maaf yang c ak lupa