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.
Solution:
Let the cost of fountain pen be y and cost of ball pen be x.
According to the given equation, we have
x = y/2 − 5
⟹ 2x = y - 10
⟹ 2x - y + 10 = 0
Here y is the cost of one fountain pen and x is that of one ball pen.