How can you solve the system? Complete the sentence. 3x + 3y = 9 -6x - 4y = -14 Multiply 3x + 3y = 9 by and add it to -6x - 4y = -14. PLZ HELP

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