Answer:
Step-by-step explanation:
A comlemetery angle is a angel or angles that add up to 90 degrees. They make a right angle. A supplemetry angle is a agle or agles that add up to 180 degrees and make a strate line.
9
You substitute 9 for x and 9 - 3 = 6
I hope it helps! Have a great day!Muffin ^^