Question

the cost of 4 pens and 4 pencil boxes is Rs100.three times the cost of a pen is Rs 15 more than the cost of a pencil box form the pair of linear equations for the above situations . find the cost of a pencil nox​

Answer 1

Step-by-step explanation:

Let the cost of a pen and a pencil be x and y respectively.

4x+4y=100

x+y=25 ...(1)

3x=y+15

3x−y=15 ...(2)

Adding (1) and (2), we get

4x=40

x=10

Substitute x=10 in equation (1) to get y=15.