Question

Diketahui f (x) =px + q jika f (2) = 7 dan f (5) = 22 , maka rumus fungsi f (x) adalah

Answer 1

F (x) = px + q
f (2) = 2p + q
2p + q = 7

f (5) = 5p + q
5p + q = 22

5p + q = 22
2p + q = 7__-
3p = 15
p = 15 / 3
p = 5

2p + q = 7
2(5) + q = 7
10 + q = 7
q = 7 - 10
q = -3

f (x) = px + q
f (x) = 5x - 3

Answer 2

F(x)= px+q di subtitusikan lalu di eliminasi

f(2)=p(2)+q=7
f(5)=p(5)+q=22
-------------------------- -
-3p = -15
p= 5 otomatis q = -3
masukkan ke dalam persamaan
f(x)=px+q
f(x)=5x-3