What is the slope of the line? (6,6) (1,-4)

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

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?