Question

The cost of a notebook is 7 rupees more than thrice the cost of a pen. Write a linear equation in two variables to represent this statement. Find out the cost of note book if the cost of a Pen is Rs5. (Take the cost of a notebook to be Rs x and that of a pen to be Rs y).​

Answer 1

Step-by-step explanation:

Linear equations

X=3Y+7

Cost of note book =(3×5)+7

=15+7 =Rs22

Answer 2

Answer:

Cost of notebook is Rs. 22

Step-by-step explanation:

Let cost of notebook = x

Let cost of pen = y

By question,

x = 3y + 7

or x = 3×5 + 7 = 15 + 7 = Rs. 22

Hope it helps! :D