Diketahui R(x) = a x + b denganF(3) = 1 dan F(1) = -1 Tentukan : a.nilai a dan b b.nilai F(-2)

R(x) = ax + b
F(3) = 3a + b = 1  
F(1) = a + b    = -1(dikurang)
           2a         = 2
             a         = 1
3(1) + b  = 1
3 + b =1
b = -2
F(-2) = -2 -2
F(-2) = -4

f(x)= ax + b
f(3) = 1 
3a + b = 1 

f(1) = - 1
a + b = - 1

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

a  + b  = -1
b = -1 - a
b = -1  - 1
b =  -2

f(x) = ax + b
f(x)=  x - 2
f(-2) = -2-2
f(-2) = - 4