What is the slope of -4x-12y=7 ?

Triangle xyz has vertices x(1,3), y(0,0)

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.

Find measure angle 1 and measure angle 3 in the kite the diagram is not drawn on the scale