Question

The cost of a note book is twice the cost of a pen. If the cost of a note book is ${}^{\prime }{x}^{\prime }$ and that of a pen is ${}^{\prime }{y}^{\prime }$ then a linear equation in two variables to represent the given condition is ____.

• A. $x+2y=0$
• B. $x-2y=0$
• C. $2x+y=0$
• D. $2x-y=0$

Answer 1

The correct option is B $x-2y=0$

Cost of notebook $=x$

Cost of pen $=y$

Given that, the cost of a notebook is twice as that of a pen.

$\therefore x=2y$

$\Rightarrow x-2y=0$