Jika f(x)=2x+b,dan f(4)=3,maka f(7)

Diketahui,
f(x) = 2x + b
f(4) = 3
f(7) = ?

Langkah 1, Tentukan nilai b
f(x) = 2x + b
f(4) = 2(4) + b
   3 = 8 + b
   b = 3 - 8
   b = -5

Langkah 2, Tentukan nilai f(7)
f(x) = 2x + b
f(7) = 2(7) + (-7)
f(7) = 14 - 7
f(7) = 7

Semoga Membantu,,,,