Multiply each equation by a constant that would help to eliminate the y terms.
2x-5y=-21
3x-3y = -18
What are the resulting equations?
6x-15y =-63
-15x+ 15y = 90
o
Ex-15y = 63
- 15x+ 15y = 90
Ex-15y =-63
- 15x+15y =-90

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