Algebraic problem - The answer is 35p per book I just need the steps to get that answ

Aoife buys x books costing y pence each for £2.80. The cost of the books are then increased by 5p each. She can now buy 2 fewer books for £2.40. Form an equation and solve it to find the initial cost of each book.

Working in pence (rather than pounds) throughout, we can write down that xy = 280. You need to write down a corresponding equation for the second case, then solve the two equations simultaneously to give you the value of y.

would the following equation be something like this?
(x-2)(y+5)=240

Yes that looks correct.

I got to that point but afterwards Im not entirely sure what to do