18.Pada fungsi f (x)=ax+b.berlaku f (0) = 1 dan f (2)=5.selisih antara a dan b adalah... A.-1 B.0 C.1 D.2 Dijawab pakai cara ya

Jawab :

f(x) = ax + b
f(0) = a(0) + b = a + b = 1
f(2) = a(2) + b = 2a + b = 5

a + b = 1
2a + b = 5
_________ +
3a = 6
  a = 2

2a + b = 5
2(2) + b = 5
4 + b = 5
      b = 5 - 4
      b = 1

A = 2
B = 1

Selisih A - B
= 2 - 1
= 1 (C)