suatu fungsi di rumuskan f(x)= ax+b. jika f(-2)= 14 dan f(3) = -1 maka nilai f(4) adalah

Diketahui :
- f(x) = ax + b
- f(- 2) = 14
- f(3) = - 1

Ditanya : f(4) = ....?

Penyelesaian :
- Nilai a :
f(- 2) = - 2a + b = 14
f(3) = 3a + b = - 1

- 2a + b = 14
3a + b = - 1
_________ _
- 5a = 15
a = 15/- 5
a = - 3

3a + b = - 1
3(- 3) + b = - 1
- 9 + b = - 1
b = - 1 + 9
b = 8

- f(4) :
f(4) = 4a + b

4a + b
= 4(- 3) + 8
= - 12 + 8
= - 4

Maaf Kalau Salah