Show that the line joining the points `(2,-6)` and `(-4,-8)` is perpendicular to the line joining the points `(4,-2)` and `(6,-8)`.

Explanation

To show that the line joining the points \( (2, -6) \) and \( (-4, -8) \) is perpendicular to the line joining the points \( (4, -2) \) and \( (6, -8) \), we will follow these steps:

### Step 1: Identify the Points
Let:
- Point A = \( (2, -6) \)
- Point B = \( (-4, -8) \)
- Point P = \( (4, -2) \)
- Point Q = \( (6, -8) \)
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