MUST EXPLAIN NOT A STRAIGHT UP ONE ANSWER OR REPORTED

Create an inequality that models the situation and explain how I wrote the equation and how I solved it, then answer the question: How many cell phones can this family have?
A cell phone company charges $50 plus $40 per line each month. Luke must spend under $170 on his family's cell phone bill each month. How many cell phones can his family have?

A. Write an inequality to solve this situation.

B. Solve the inequality to answer how many cell phones this family can have.

C. Explain how you solved the inequality.