Sebuah fungsi f ( x ) = ax + b jika f ( 3 ) = – 1 dan f ( – 3 ) = – 13 maka nilai f ( 6 ) adalah…
Jawaban Terkonfirmasi
Jawab :
f(x) = ax + b
f(3) = a(3) + b = 3a + b = -1
f(-3) = a(-3) + b = -3a + b = -13
3a + b = -1
-3a + b = -13
____________ –
6a = 12
a = 2
-3a + b = -13
-3(2) + b = -13
-6 + b = -13
b = -13 + 6
b = -7
f(x) = ax + b = 2x – 7
Maka : Nilai f(6) = 2(6) – 7
= 12 – 7
= 5