Question

Diketahui fungsi (x)= px +q jika bayangan 4 adalah -1 dan bayangan 7 adalah 5 Tentukan:
A.Nilai a dan b
B.Rumus fungsinya
C.Nilai f (6)

Answer 1

F(x) = px+q
f(4) = -1
==> 4p + q = -1
f(7) = 5
==> 7p +q = 5

a)
4p + q = -1
7p + q = 5
---------------- -
-3p = -6
p = 2

4(2) + q = -1
8 + q = -1
q = -1-8
q = -9

b) f(x) = 2x - 9
c) f(6) = 2(6) - 9 = 12 - 9 = 3