I need help this is due today please it’s my last problem

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?

3x + 4y = 5 x- 3y = -7 solve by substitution

Which term describes the point where the perpendicular bisectors of the three sides of a triangle intersect?