You need to solve a system of equations. You decide to use the elimination method. Which of these is not allowed?
2x - 3y = 12
Equation 1
-2x + y = 8
Equation 2
O A. Add the left side of equation 2 to the left side of equation 1.
B. Add equation 2 to equation 1.
C. Multiply equation 2 by 3. Then subtract the result from equation 1.

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

If m 17 27 90 63 ** picture is attached

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