suatu fungsi f di nyatakan dengan rumus f(x) = ax + b, jika f(3) =17 dan f (-2) = -3 maka nilai f(5) adalah

f(x) =ax + b
f(-2) = -3 =(-2a) +b = -3
f(3) = 17 = 3a +b = 17
------------------------------- -
-5 a = - 20
a = - 20 ÷ -5 = 4
3a + b = 17
3×4 +b =17
12 +b =17
b = 17-12 = 5
f(×) =ax + b
f(5) = (4 ×5) + 5
= 20 +5 =25
maaf kalau salah

f(x) = ax + b
f(3) = 3a + b = 17
f(-2) = -2a + b = -3
_________________ -
             5a = 20
               a = 4

-2a + b = -3
-8 + b = -3
b = 5

f(x) = ax + b
f(5) = 4(5) + 5
      = 25