Prove that: The straight line passing through the two points \( A(-3, 4) \) and \( C(-3, -2) \) is perpendicular to the straight line passing through the two points \( B(1, 2) \) and \( D(-3, 2) \).
Proof:
Slope \( m_1 = \frac{-2 - 4}{-3 - (-3)} = \frac{-6}{0} \) → undefined (vertical line)
Slope \( m_2 = \frac{2 - 2}{-3 - 1} = \frac{0}{-4} = 0 \) (horizontal line)
∴ The two lines are perpendicular
Slope \( m_2 = \frac{2 - 2}{-3 - 1} = \frac{0}{-4} = 0 \) (horizontal line)
∴ The two lines are perpendicular
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