Question

The cost of pens and 4 pencil boxes is Rs 100 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 situation Find the cost of a pen and a pencil box​

Answer 1

Answer:

x+4y=100. Eq 1

x-3y=15. Eq2

Step-by-step explanation:

Eq 1-eq 2

So. x-x+4y+3y=85

7y=85

y=85/7 cost of pencial

Put the value of y in eq 1

x-85/21=15

x=15/1+85/21

X=400/21