## 1. EXERCISE 4.1 The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this

Question

1.
EXERCISE 4.1
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 notebo​

in progress 0
4 weeks 2021-10-29T19:10:55+00:00 2 Answers 0 views 0

1. Step-by-step explanation:

## This is the required linear equation in two variable.

2. Equation = x 2y = 0

Step-by-step explanation:

Given:

• Cost of a notebook is twice the cost of a pen.

To Write:

• Linear equation in two variables.

Solution: Let the cost of a pen be Rs y and cost of a notebook be Rs x. Therefore,

➱ Cost of a notebook = 2 times of cost of pen

➱ Cost of a notebook = 2 times of y

➱ x = 2y or

➱ x – 2y = 0 [ Transported to LHS from RHS ]

Hence, x – 2y = 0 is the linear equation in two variable.

### ____________________

★ What is linear equation in two variable ?

=> An equation which in the form of ax + by + c = 0, where a , b , c are real numbers and a and b are not both zero ( a 0 , b 0 ) , then it is called a linear equation in two variable x and y.