I need someone to explain how to do this

Areal estate agent earns $32,000 a year plus $1,000 for each apartment he sells. write an equation that shows the relationship between the number of apartments abe sells,n, and the total amount he earns in a year,e. what is the total amount abe would earn from selling 10 apartments in one year

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Which shows a reasonable estimation for 124% of 42 using the distributive property?