Can someone solve B for me please? Thank you!

7x+8y=-18, 4x-9y=-3 solve the system of equations

How much orange juice do you need to make 2 servings of lemony orange slush?

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.