Let us consider the Example 3 of Section 3.2. Will the rails cross each other?

Explanation

To determine whether the two rails represented by the equations \( x + 2y - 4 = 0 \) and \( 2x + 4y - 12 = 0 \) cross each other, we need to analyze the equations step by step.

### Step 1: Write down the equations
We have two equations:
1. \( x + 2y - 4 = 0 \) (Equation 1)
2. \( 2x + 4y - 12 = 0 \) (Equation 2)

### Step 2: Solve Equation 1 for \( x \)
...