Circle X centered at the origin withe the radius 10

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

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?