Question

Diketahui f(x)=ax+b. Tentukan bentuk fungsi berikut jika f(1)=3 dan f(2)=5

Answer 1

F(1) = ax + b = 3
         a(1) + b = 3
         1a + b = 3
f(2) = ax+b = 5
       a(2) + b = 5
       2a + b = 5

1a + b = 3
2a + b =5
___________ -
-1a + b = -2
a = -2/-1 = 2

1(2) + b = 3
2+b = 3
b = 3-2
b=1

f(x) = 2x + 1