SOLUTION: Explain why the solution of |-3b|=9 is the same as the solution of |3b|=9

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Question 558209: Explain why the solution of |-3b|=9 is the same as the solution of |3b|=9
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Assuming x and y are a real numbers, this means that |xy| = |x||y|


So |-3b| = |-3||b| = 3|b| = |3||b| = |3b|


This means that |-3b| = |3b| for every real number b.


So |-3b|=9 is equivalent to |3b|=9
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