5x-2y>9 what is the boundary line

Which statement explains how you could use coordinate geometry to prove that quadrilateral abcd is a parallelogram? -5 -4 -3 -2 -1 t 1 2 3 4 prove that all sides are congruent and have slopes that are opposite reciprocals prove that segments ad and ab are congruent and parallel prove that opposite sides are congruent and have equal slopes prove that segments bc and cd are congruent and parallel

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Find the solution of this system of equation -7x+y=-20 9x-3y=36