Question

Diketahui fungsi f(x)= Px+q jika f(6)=15 dan f(2)= 7 maka nilai f(1) adalah

Answer 1

6p + q = 15
2p + q = 7. ....... 1. eliminasi
=> 4p = 8
p = 2

6(2) + q = 15. ...... 2. substitusi
q = 15 - 12
q = 3

f(1) = 2(1) + 3
= 5

jadi jawabannya 5.

Answer 2

F(x)= Px + q.
f(6)=p.6 + q=15
f(2)=p.2+q =7
6p+q=15
2p+q=7
=(6 - 2)p=(15 - 7)
=4p=8
=p=8÷4
p=2
2p+q=7
2×2+q=7
4+q=7
q=7-4
q=3
jadi,f(1)=1×2+3=5