Question

Diketahui f(x)=ax+b.tentukan bentuk fungsi fungsi berikut jika: a) f(o)=-6 dan f(3)=-5 b)f(2)=3 dan f(4)= 4

Answer 1

F(x) =ax + b
a) f(0) = -6
= b = -6
f(3) = - 5
= 3a + b = -5

3a + b = -5
3a + (-6) = -5
3a = -5+6
3a = 1
a = 1/3
f(x) = 1/3x - 5

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