Question

1. Suatu fungsi f(x)=ax+b menghasilkan (1,-2) dan (-2,-11).
Tentukan (K),(L),(M),jika
(K,-8) (-8,L) (3,M)

Answer 1

F(x) = ax + b
f(1) = -2
f( -2) = -11

cari rumus fungsinya dulu,
cari nilai a dan b
       - 11 -(-2       - 9
a  = ----------  = ------ = 3
         -2  - 1        -3

f(1) = -2
ax + b = -2
3x + b = -2
3(1) + b = -2
3 + b = -2
b = -5

maka rumus fungsinya
f(x) = ax + b
f(x) = 3x - 5

( K , - 8)
3K - 5 = - 8
3 K = - 3
  K = -1

( - 8 , L)
3(8) - 5 = L
24 - 5 = L
L = 19

(3 , M)
3(3) - 5 = M
9 - 5 = M
M = 4