15. ABCD is a quadrilateral in which AD = BC and ∟DAB = ∟CBA. Then
prove that ∆ABD ≅ ∆BAC and BD = AC
16. Locate the points (0, 5), (-3, 5), (-3, -5), (6, -1) in the Cartesian plane.
17. Find four different solutions of the equation 2x + y = 7
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