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Answer:
y = 9
Step-by-step explanation:
since opposite sides are congruent and opposite angles are conguent, we use an equal sign
2y + 9 = 27
Step 1: Subtract 9 from both sides.
2y+9−9=27−9
2y=18
Step 2: Divide both sides by 2.
2y/2 = 18/2
y = 9