suatu fungsi f dinyatakan dg rumus f(x) sx + t jika f (3) : 13 dan f (-1) : 1 tentukan a. nilai s dan t b. f(5)

f(x) = sx + t
a) f(3) = 3s + t = 13
f(-1) = - s + t = 1
-------------------------- (-)
4s = 12
s = 3
- s + t = 1
- 3 + t = 1
t = 1 + 3
t = 4

b) f(x) = 3x + 4
f(5) = 3(5) + 4 = 15 + 4 = 19