Question

Suatu fungsi f dinyatakan dengan rumus f (x) = ax + b . jika f (2) = 3 dan f (-3) =13 , tentukan nilai -a + b

Answer 1

2a + b = 3
-3a + b = 13
-------------------- -
5a = -10
a = -2

2(-2) + b = 3
-4 + b = 3
b = 3+4
b = 7
-(-2) + 7
= 2+7 = 9

Answer 2

F(x)=ax+b
f(2)=a(2)+b =3
f(-3)=a(-3)+b =13 (dikurang)
5a = -10
a = -2
2(-2)+b= 3
-4+b =3
b =3+4
b = 7
-a+b = -(-2)+7
= 2 + 7
= 9