Question

Suatu fungsi dinyatakan dengan rumus f(x) = mx + n. Jika f(2) = 7 dan f(6) = 27, nilai f(8) adalah

Answer 1

Dik : f(x) = mx + n
f(2) = 7
f(6) = 27
Dit : nilai f(8) = ...
Hit : Pertama-tama kita harus mencari nilai m dan n nya
Hit : f(2) = 2m + n
       7 = 2m + n
       f(6) = 6m + n
       27 = 6m + n
Subsitusikan!
2m + n = 7
6m + n = 27 -
- 4m = - 20
m = 5

2m + n = 7
2(5) + n = 7
10 + n = 7
n = 7-10
n= -3

Rumus = 5x - 3
f(8) = 5(8) - 3
f(8) = 40 - 3
f(8) = 37

Answer 2

DIK :f(x)=mx+n
f(2)=7
f(6)=27
DIT :f(8)=?
JAWAB :
f(x)=mx+n
f(2)=7
7=m(2)+n
7=2m+n...(1)
f(6)=27
27=m(6)+n
=27=6m+n...(2)
7 =2m+n
27=6m+n -
-20= -4m
=-20/-4= -4m/-4
= 5= m
7=2(5)+n
7=10+n
7-10=n
-3=n

f(x)=5x-3
f(8)=5(8)-3
=40-3
=37