The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement. (Take the cost of a notebook to be ` x and that of a pen to be ` y).

Question

The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.  (Take the cost of a notebook to be ` x and that of a pen to be ` y).

cdquestions Admin · Accepted Answer

Let the cost of a notebook and a pen be x and y respectively.  Cost of notebook = 2 × Cost of pen x = 2y x − 2y = 0.

Length (in hours)	Number of lamps
300 − 400	14
400 − 500	56
500 − 600	60
600 − 700	86
700 − 800	74
800 − 900	62
900 − 1000	48

Length (in hours)	Number of lamps
300 − 400	14
400 − 500	56
500 − 600	60
600 − 700	86
700 − 800	74
800 − 900	62
900 − 1000	48

The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.
(Take the cost of a notebook to be ` x and that of a pen to be ` y).

Solution and Explanation

Top CBSE Class IX Mathematics Questions

Top CBSE Class IX Questions