fungsi f(x)=ax+b jika diketahui f(3)=15 dan f(5)=20 tentukan nilai a dan b

Dik. f(x) = ax + b, f(3) = 15, & f(5) = 20
Dit. nilai a & b?

Jawab...

f(x) = ax + b

f(3) = 3a + b = 15
f(5) = 5a + b = 20
---------------------- -
@ -2a = -5
@ a = 2,5

b :
3a + b = 15
3(2,5) + b = 15
7,5 + b = 15
b = 15 - 7,5
b = 7,5


Semoga membantu.. ^_^