3. Justify each step of the solution by stating the property that was used to get to each step.
Given: 2(10 − 13x ) + 9x = −34x + 60
Step 1: 20 − 26x + 9x = −34x + 60
Step 2:
−17x = −34x + 40
Step 3: 17x = 40

Step 4:


x = 40 17

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.