Question

Suatu fungsi dinyatakan dengan rumus f(x)=ax+b, jika f(3)=13 dan f(-1)=1, tentukan:
a. nilai a dan b
b. bentuk fungsi f

Answer 1

Verified answer

F (x) = ax + b
f (3) = 13
f (-1) = 1
3a + b = 13
-1a + b = 1
_______ _
4a = 12
a = 12/ 4
a = 3

3a + b = 13
3.3 + b = 13
9 + b = 13
b = 13 - 9
b = 4

a. a = 3, b = 4
b. f (x) = 3x + 4
semoga membantu -,-

Answer 2

Verified answer

Chapter Function
Mathematics
Class 8 SMP

Settlement

 f (x) ⇒ ax + b
 f (3) ⇒  3a + b = 13
f (-1) ⇒ -1a + b = 1          
              --------------- -                    
                    4a = 12                     
                      a = 3


          3a + b = 13
      3 (3) + b = 13
           9 + b = 13           
                 b = 13 - 9                     
                 b = 4


Function Shape (Function Formula)

f (x) = ax + b

⇒ f (x) = 3x + 4


I hope this helps!!!