F(-8):0 F(0):4 F(×):... F(-4):.. Pakai caranya ya..

Bab Fungsi
Matematika SMP Kelas VIII

f(x) = ax + b

f (-8) = -8a + b = 0
            -8a = -b
             8a = b

f (0)  = 0 . a + b = 4
                       b = 4

8a = b
8a = 4
a = 4/8
a = 1/2

f(x) = 1/2 . x + 4

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f(-4) = 1/2 . (-4) + 4
       = -2 + 4
       = 2