Question

The cost of ball pen is Rs5 less than half of the cost of fountain pen write this statement as a linear equation in two variables

Answer 1

let the price of ball pen be 'x'
and of fountain pen be 'y'
x = y/2 - 5

Answer 2

let ball pen be x
and fountain pen be y
$x + 5 = \frac{1}{2}y \\ 2x + 10 = y \\ 2x - y = - 10$