SOLUTION: If three times a number is increased by 6, the result is 21. The number is 1)5 2)9 3)15 4)-9

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Question 199013: If three times a number is increased by 6, the result is 21. The number is
1)5
2)9
3)15
4)-9
Answer by AbyBavy(4) About Me  (Show Source):
You can put this solution on YOUR website!
To solve this you must first set up an equation. three times a number would be written as 3x. increased by 6 means you are adding six to your 3x. The result is telling you the problem equals 21.
3x+6=21
To solve you would first subtract 6 from each side. A possitive 6 minus a negative 6 will cancel out your 6's on the left side. You then do 21-6= 15
Your problem should now look like this:
3x=15
You then divide 3 from both sides. 3x divided by 3 cancells out the 3's so you are left with just x. 15 divided by 3 comes out to be 5. Therefore your answer is #1.
three times a number is increased by 6, the result is 21. The number is 5.