Question

The table shows the outputs y for different inputs x:

Answer 1

A.
Yes, because for every argument (x) there is only one corresponding value (y).

B.
$f(7)=2\cdot7+13=27$
The function $f(x) = 2x + 13$

C.
$75=2x+13\\ 2x=62\\ x=31$