Question

if 5 books and 7 pens cost 79 and 7 books and 5 pens cost 77 then how much does one book cost?

Answer 1

Answer:

Step-by-step explanation:

Very easy make both equation

Like let cost of book =x and cost of pen =y

So

5x +7y =79

And

7x+5y=77

Eliminate on of x or y and get the answer

If u r not able to do so aske in comments I will give u explanation