Answer :
The given information is Lisa and John bring home $72,000 a year.
Let's set y the total amount they bring home in a year and m the amount per month.
An expression to represent how much they make in a month (knowing a year has 12 months) will be:
[tex]\begin{gathered} m=\frac{y}{12} \\ \\ \text{ As we know y=72,000, so:} \\ m=\frac{72000}{12}=6000\text{ \$/month} \end{gathered}[/tex]