Anna works at an electronics store as a
salesperson. Anna earns a 5% commission
on the total dollar amount of all phone
sales she makes, and earns a 7%
commission on all computer sales. Anna
made a total of $2100 in sales and earned
$119 in commission. Write a system of
equations that could be used to determine
the dollar amount of phone sales Anna
made and the dollar amount of computer
sales she made. Define the variables that
you use to write the system.