# How do you write a variable expression for the word phrase "9 less than k"?

Jun 19, 2018

$k - 9$

#### Explanation:

The operand we use to express something "taken away" from something is the difference.

So, if we start from some number $k$, $k - 1$ means that we took $1$ away from $k$, so $k - 1$ is $1$ less than $k$.

Going on, $k - 2$ is $2$ less than $k$, and $k - 3$ is $3$ less than $3$, because we took away $3$ from $k$, and so on...

So, $k - 9$ is $9$ less than $k$, since we took $9$ away from $k$