Question

Diketahui f(x) = ax+b
jika f(2) = 8 dan f(1) = 5
tentukan f(5)

Answer 1

F(x) = ax+b
f(2) = 2a + b = 8
f(1) = a +b = 5
       -------------------- (-)
pake eliminasi, jadi b nya ilang
a = 3

f(1) = a.1 + b = 5
         3 +b = 5
         b = 2

f(5) a.5 + b = 3.5 + 2
                = 15 +2
                = 17