Respuestas de el libro de Matemáticas 1 de secundaria página 53

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

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?

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined