suatu fungsi di rumuskan f (x) = a+b jika di ketahui f (3) =15 dan f(5) =20 tentukan bentuk fungsinya

Materi Fungsi

f(x) = ax + b
f(3) = 3a + b = 15
f(5) = 5a + b = 20
------------------------ -
-2a = -5
a = 5/2, jadi
3(5/2) + b = 15
b = 15 - 15/2 = 15/2
Jadi,
f(x) = (5/2)x + 15/2

f (x) = ax +b

f(3) = 3a + b = 15
f(5) = 5a + b = 20
——--—————— -
-2a = -5
a = 5/2

5a + b = 20
b = 20 - 25/2
b = 40-25/2 = 15/2


persamaan
f(x) = 5/2x + 15/2 = (5x+15)/2