I was doing 11 question in end of the chapter excercise of chapter orienting yourself: the use of coordinate geometry. The solution given in this app is slightly confusing when you find p. Can anyone give an simpler solution?
From a pair of linear equations in the following, and their solution graphically i) 5 pencils and 7 pens together cost ₹50, whereas 7 pencils and 5 pens together cost ₹46. Find the cost of one pencil and that of one pen