Prove by using the slope that the points \( A(-1, 3) \), \( B(5, 1) \), \( C(6, 4) \) and \( D(0, 6) \) are the vertices of the rectangle ABCD.
\( \overleftrightarrow{AB} \parallel \overleftrightarrow{CD} \)
\( \overleftrightarrow{AD} \parallel \overleftrightarrow{BC} \)
\( \overleftrightarrow{AB} \perp \overleftrightarrow{BC} \)
∴ The figure ABCD is a rectangle
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