Question

the price of 3 pen and 7 pencil is 29 rupees.The price of 4 pen and 5 pencil is 30 rupees.what is the price of a pen?And the price of a pencil?​

Answer 1

₹5

hope it will help you

Answer 2

Answer:

Price of One pen 5,and pencil 2

Step-by-step explanation:

Let x be the price of pen,

y be the price of pencil

Given that

3x +7y =29 (eqn1)

4x+5y=30(eqn2 )

Eqn1 *4

Eqn2*3

We get

12x+28y=116 (eqn 4)

12x+15y=90(eqn 5)

Eqn4-eqn5(difference)

We get

13y=26

y=26/13 =2

Substituting y=2 in eqn 1

We get 3x+7*2=29

3x=29-14

3x=15

x=15/3=5