Functions Practice Questions

Here is a number machine.

Work out the output when the input is 9

The diagram shows a number machine.

Find the output when the input is 7

The function $f$ is given by

$$f(x) = 2x + 9$$

Work out the value of $f(5)$

The function $g$ is given by

$$g(x) = \frac{3x - 4}{5}$$

Work out the value of $x$ for which $g(x) = 7$