$\"\"$

Let x is the input and y is the output.

The word $\"\"$ times $\"\"$ indicates multiplication and the symbol $\"\"$ .

The word $\"\"$ less than $\"\"$ indicates subtraction and the symbol $\"\"$ .

The word $\"\"$ is $\"\"$ indicates the symbol $\"\"$ .

The word $\"\"$ The output y of a function is 9 less than 10 times the input x $\"\"$ indicates the equation $\"\"$ . $\"\"$

Substitute the value of $\"\"$ (output value) in the function equation $\"\"$ .

$\"\"$

Add 9 to each side.

$\"\"$

Divide each side by 10.

$\"\"$

Cancel common terms.

$\"\"$ . $\"\"$

The equation for function $\"\"$ and the input value is $\"\"$ .