Question

Fungsi f dinyatakan dengan rumus f(x)=ax+b.jika f(2)=3 dan f(-3)= 13, nilai b-a adalah

Answer 1

B-a = 7- (-2)
= 7+2
=9

Answer 2

F(x) = ax + b
f(2)  = 2a  + b = 3.... (1)
f(-3) = -3a + b=13.....(2)
eliminasi pers. (1)dan (2) : 
-3a + b = 13
 2a + b =  3
---------------- -
      -5a = 10
         a = -2

2a + b = 3
2(-2)+b= 3
-4 + b = 3
       b = 7
b - a = 7 - (-2)
        = 7 + 2
        = 9