Let us consider Example 2 in Section 3.3, i.e., the cost of 2 pencils and 3 erasers is Rs 9 and the cost of 4 pencils and 6 erasers is Rs 18. Find the cost of each pencil and each eraser.

Explanation

To solve the problem, we need to set up a system of equations based on the information given.

### Step 1: Define the Variables
Let:
- \( x \) = cost of one pencil
- \( y \) = cost of one eraser

### Step 2: Set Up the Equations
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