Question

Tolong dijawab no. 1, 2, 3

Answer 1

1. Jika f(x) = ax + b
           f(3) = 9
           f(1) = -11
Tentukan :
a. f(x)
f(3) = 3a + b = 9
f(1) =   a + b = -11
--------------------------  -
          2a       = 20
            a       = 20/2
            a       = 10
Substitusikan a = 10 ke dalam salah satu fungsi
f(3) = 3a + b = 9
         3(10) + b = 9
         30  + b = 9
                  b = 9-30
                  b = -21
f(x) = ax + b
f(x) = 10x - 21
b. f(-4)
f(-4) = 10(-4) - 21
f(-4) = -61
c. Nilai x jika f(x) = 5
f(x) = 10x - 21 = 5
f(x) = 10x        = 5 + 21
f(x) =     x        = 26/10
              x        = 2,6
Maaf, cuma tau yang nomor 1 >___<"