Respuesta :

[tex]\begin{gathered} f(x)\text{ = 3x + 1} \\ \end{gathered}[/tex]

find f(x) = 10

x is a place holder but f(x) = 10. Therefore,

x = 3 for f(x) = 10

f(3) = 3(3) + 1

f(3) = 9 + 1

f(3) = 10