Question

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

Answer 1

Let the cost of the pen be y and the cost of notebook be x.
According to statement,
Cost of a notebook = twice the pen = 2y.
$\therefore 2y=x$
$\Rightarrow x-2y=0$
This is a linear equation in two variables to represent this statement.