Question

The cost of the book is twice the cost of the pen by 20. Express this in linear equations in 2 variables.

Answer 1

Step-by-step explanation:

Hey the answer is....

Let the cost of pen be x rupees.

Then twice the cost of pen = 2 ☓ x rs.

Twice the cost of pen = 2x rupres.

So,

Cost of book = rs 20 more than twice the cost of pen

Cost of book = rs 2x + 20

The eq is 2x + 20

Answer 2

Answer:

x=20

Step-by-step explanation:

let the cost of the book be Rs x

:. the cost of the pen = 2x

x + 20 = 2x

20 =2x -x

x=20