Can someone me with question 20. and show work so i can understand it

Solve 2x+y=3 x+y=5 in substitution method

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct