Question

The cost of ball pen is Rs 5 less than half of the cost of fountain pen. Write this statement as a linear equation in two variables.

Answer 1

Let cost of a fountain pen = Rs x

and cost of ball pen = Rs y

$\therefore$ According to the condition,

$y=\frac{x}{2}-5$

$\Rightarrow 2y=x-10$

$\Rightarrow x-2y-10=0$