Jika f (0)= 1 dan f (2)= -3 untuk suatu fungsi f= x = > ax+b, tentukanlah A. Nilai a dan b B. Nilai f(1) f(3) f(5)

Bab Fungsi
Matematika SMP Kelas VIII

a] f(0) = a . 0 + b = 1
b = 1

f(2) = 2a + b = -3
2a + 1 = -3
2a = - 3 - 1
a = -4/2
a = -2

maka, a = - 2 dan b = 1

b] f(x) = -2x + 1
f(1) = -2 . 1 + 1 = - 1

f(3) = -2 . 3 + 1 = -5

f(5) = -2 . 5 = -9