Which of the lines below is parallel to y = 7x + 5 a. y = -1/7 x + 1
b. y = 7x - 3
c. y = -7x + 10
d. y = 1/7 x - 20

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.