Question

Dik f(x)=ax+b.jika f (4)=-3& f (-2=)9.
nilai f (6) adlah

Answer 1

F(4) = 4a + b = -3
f(-2) = -2a + b = 9
         ----------------- -
                -6a = -12
                   a = -12/-6
                   a = 2

4a + b = -3
4.2 + b = -3
8 + b = -3
b = -3 - 8
b = -11

f(6) = 6a + b
      = 6.2 + -11
      = 12 + -11
      = 1

Answer 2

F (4)  = 4a + b =  -3
f (-2) = -2a + b = 9

di eliminasi substitusi kan
b nya hilang

6a = -12
 a = -2

substitusikan pada f (-2)
ketemu b= 5

nilai f (6) = 6a + b = 6.-2 + 5 = -12 + 5 = -7

semoga membantu