Question

Suatu fungsi dengan rumus f(x)=a+b jika f(-3)=7 dan f(5)=-1, maka rumus fungsi tersebut adalah

Answer 1

f(x) = ax + b

f(-3) = 7
     7 = -3a + b ... [ pers. 1 ]

f(5) = -1
  -1 = 5a + b ... [ pers. 2 ]

a = -1
b = 4

Rumus fungsi :
f(x) = ax + b
f(x) = -x + 4
f(x) = 4 - x

Answer 2

F(x) = ax + b
f(-3) = -3a + b = 7
f(5) = 5a + b = -1
a = -1
b = 4

f(x) = ax + b
f(x) = -x + 4
jadi, f(x) = 4 - x