What is the slope of the line?

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?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Find the value of x. round the length to the nearest tenth