Andrea T.

asked • 10/23/13

pre algebra question

Please solve and show work
 
-7 = m/2

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Christian B. answered • 10/23/13

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All you have to do is multiply both sides by 2, which will leave M = to the answer when you multiple -7 by 2.

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Andrea T.

Hi hope you're still around.  I had a typo my question was suppose to be -7=m/-42
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10/23/13

Vivian L.

I am still here!
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10/23/13

Vivian L.

Sorry!  I forgot to answer.
-7=m/-42
Multiply both sides by -42...
(-42)(-7)=(m/-42)(-42)
A negative multiplied by a negative is positive.
294=m
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10/23/13

Andrea T.

Thanks!  I got it right!  I did the same as you did in the previous.  Thanks for your help.
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10/23/13

Andrea T.

OH But I just realized I didn't multiply by -42 I multiplied a positive to cancel out the denominator.  Was that wrong?
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10/23/13

Vivian L.

There are various techniques to accomplish the same end.  You can multiply by +42, as long as your final result is positive, and you show such work.
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10/23/13

Beth L. answered • 10/23/13

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Remember that multiplying NEGATIVE TIMES A NEGATIVE RESULTS IN A POSITIVE.  Dividing 2 numbers that are negative also result in a positive.
 
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Andrea T.

if I multiply -42*-42, it doesn't cancel out I get 1764,,,,.  I don't get it.  Please explain.  What is my answer?  I thought I had to cancel out
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10/24/13

Vivian L.

-7=m/-42
You will multiply both sides by -42 to isolate m.
(-7)(-42)=(m/-42)(-42)
You will not multiply -42 by -42.
On the right side, this number is originally the numerator.  The multiplying the factor is the denominator.  It therefore cancels.
 
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10/24/13

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