Suatu fungsi f(x) = ax + b.jika f(1)=3 dan f(-3)=11,maka nilai f(5) adalah

Mencri a
f(1) = 3 => a + b = 3
f(-3) = 11 => -3a + b = 11
--------------------------------- -
4a = -8
a = -2
Mencari b
a + b = 3
(-2) + b = 3
b = 5
Rumua fungsi
f(x) =-2x + 5
Maka
f(5) =-2(5) + 5
f(5) = -5

f(×) = a× + b

f(1) = a + b = 3
f(-3) = -3a + b = 11
------------------- -
4 a = - 8
a = -8 / 4
a = - 2

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

f(5) = a× + b
f(5) = -2(5) + 5
f (5) = -10 + 5
f(5) = -5