if k is a constant, is the line y = mx + k perpendicular to the line y = -mx + k ? Explain the reasoning.

What is the value of x in the diagram below?

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2