Question

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 a pen be ${}^{\prime }{y}^{\prime }$.

And, the cost of a notebook be ${}^{\prime }{x}^{\prime }$

It is given that the cost of notebook $=2\times$ cost of a pen

$\therefore x=2y$