Answer: C) add 12 to both sides
Reason:
We add 12 to the left side to undo the -12, which will get y by itself.
We must do the same thing to both sides to keep things balanced.
Eliminate the opponent number
Change the sign of both sides of the equation
Divide both sides by the same number
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Answer:x=15
Step-by-step explanation:
You should collect the like terms first
21-6=x
Therefore
X=15
Answer: Angle MNO
Step-by-step explanation: Supplementary angles equal 180, or a straight line.