Question

The cost of a pencil is ruppees 4 less than the cost of a pen . write the cost of pencil in term of cost of a pen ( take a cost of pen as y )
​

Answer 1

Answer:

There is a common sense solution and an algebraic one. (Both admit quite a few variations.)

If a pen is twice more expensive than a pencil, 3 pencils and 4 pen cost as much as 3 + 2×4 = 11 _________

. By the same token, 4 pencils and 3 pens would cost as much as _________

pencils. The difference of $1 is then the price of 11 - 10 = 1 pencil. So a pencil goes for $1 and a pen which is twice as expensive costs $2.

You are welcome to check the result (and checking your results is a very good practice) by adding the costs of pens and pencils in the required quantities and verifying that the difference is indeed $1. We shall solve the problem algebraically and see if that leads to the same answer.

Let x be the price of a pencil and y the price of a pen. We know that

Answer 2

Answer:

y-4

Step-by-step explanation:

if the cost of pencil is 4 less than the cost of pen

and the cost of pen is y

so the cost of pencil is = y-4

I hope you like my answer