Question

Dik: f(x) = ax+b jika f(2) = 11 dan f (-1) = 2 tentukan nilai f (5) ....

Answer 1

2a + b = 11
-a + b = 2    -
3a       = 9
a         = 3

-a + b = 2
-3 + b = 2
-3-2 = -b
5 = b

f(5) = ax+b
     = 3(5) + 5
      = 15 + 5
      = 20

Answer 2

2a+b=11
-a+b=2
------------   --
    3a=9
     a=3

-a+b=2
-1x3+b=2
-3+b=2
b=2+3
=5

3x5+5=15+5=20

jawaban terbaik ya :)