In algebra, we often study relationships where a change to one variable causes change in another
variable. Describe a situation you're familiar with
where one quantity changes constantly in relation
to another quantity. How are the two quantities in
the situation related? If you represent the two
quantities on a graph, what will it look like?

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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

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