Question

Tolong bantu ya nomor 15 dan 16

Answer 1

F(4) = ax + b = -2
         a(4) + b = -2
         4a + b =-2..........(1)
f(-4) = ax + b = 6
          a(-4) + b = 6
          -4a + b = 6..............(2)
4a + b = -2
-4a +b = 6
---------------- +
      2b = 4
        b = 4/2 = 2

4a + b = -2
4a + 2 = -2
      4a = -2 -2
      4a = -4
        a = -4/4 = -1

f(8) = ax + b 
      = -1(8) + 2
      = -8 + 2
      = -6 (c)

Answer 2

Rumus : f(x) = ax + b
jadi
f(4) = a(4) + b = -2
     4a + b = -2
f(-4) = a(-4) + b = 6
   -4a + b = 6
 
jadi
4a + b = -2
-4a + b = 6
----------------------  +
       2b = 4
         b = 2

jadi a
 4a + b = -2
4a + 2 = -2
4a = -2 - 2
4a = -4
a = -1

jadi f(8) = ax + b =....
             -1*8 + 2 = -6

semoga bermanfaat
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