How to solve this? cómo lo resuelvo?

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

What is the range for 31,39,29,34,37,24,36,33,34,28

Plot the intercepts to graph the equation