Question

The price of 2 pens and 3 notebooks is 40rupees,and the price of 2 pens and 5 noteboks is 60 rupees.what is the price of a pen ?and the price of a note book?

Answer 1

Answer:

pen = rs5

notebook = 10

Step-by-step explanation:

3 nb =30r and 5 nb cost = 50

50 _30=20/10

=10 r

Answer 2

Answer:

cost of 1 pen = x = 5

cost of 1 note book = y = 10

Step-by-step explanation:

let cost of 1 pen be x

let cost of 1 note book be y

2x + 3y = 40 equ (1)

2x + 5y = 60 equ (2)

subtract (2) - (1)

we get

2y = 20

y = 20/2 = 10

substitute y in equ (1)

2x + 3(10) = 40

2x + 30 = 40

2x = 40 - 30

2x = 10

x = 10/2 = 5

therefore

cost of 1 pen = x = 5

cost of 1 note book = y = 10