Question

5 pencils and 7 pens together cost Rs 50, whereas 7 pencils and 5 pens together
cost Rs 46. Find the cost of one pencil and that of one pen. find graphically
​

Answer 1

Answer:

cost of pencil is ₹3

cost of pen is ₹5

Step-by-step explanation:

Let cost of pencil = x

    cost of pen = y

According to question,

                                5x + 7y = ₹50  ....  (i)

                                7x + 5y = ₹46  ....  (ii)

     

As shown in the picture, we get (3,5) as the intersection of the two equations.

          Therefore, x =3, i.e., cost of pencil is ₹3

                             y =5, i.e., cost of pen is ₹5