Question

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

• A. 2x – y + 10 = 0
• B. x + 2y + 10 = 0
• C. x + 9y + 14 = 0
• D. x + y = 5

Answer 1

The correct option is A 2x – y + 10 = 0

Let the cost of fountain pen be y, and the cost of a ball pen be x.

According to the given statement,

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

or 2x = y - 10

or 2x - y + 10 = 0