Question

Suatu fungsi dirumuskan dengan f(x)=ax+b. jika f(-2)=-5 dan f(3)=15 nilai f(8) adalahh ...

Answer 1

F(-2) = -2a + b = -5
b = -5+2
= -3
f(3) = 3a + -3 = 15
= 3a = 18
a = 6

f(8) = 8.3 + 6 = 30

Answer 2

F(x) = ax+b
f(-2) = -2a+b = -5
f(3) = 3a+b = 15
____________ _
-5a = -20
a = 4
= 3.4+b =15
12+b = 15
b = 15-12
b = 3

f(8) = a.8+b
4.8+3
32+3 = 35

maaf kalau salah.