Question

2) The price of 4 note books and 7 pens is 115 rupees and The price of 4 note books and
2 pens is 90 rupees What is the price of a note book? What is the price of a pen ?​

Answer 1

Answer:

price of 1 notebook=₹15

price of 1 pen=₹5

Step-by-step explanation:

let price of 1 pen = x

let price of 1 notebook = y

4y+7x=115 ....1

4y+2x=90

4y=90-2x .....2

put equation 2 in 1 ,

90-2x+7x=115

90+5x=115

5x=115-90

5x=25

x=25/5

x=5

price of 1 pen=₹5

put value of x in equation 2 ,

4y=90-2(15)

4y=90-30

4y=60

y=60/4

y=15

price of 1 notebook=₹15

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