Inactive Tutor answered • 10/23/13
Tutor
New to Wyzant
Hi Again Andrea;
-7 = m/2
Let's isolate m by multiplying both sides by 2...
2(-7)=m/2(2)
-14=m
Andrea T.
asked • 10/23/13pre algebra question
Please solve and show work
-7 = m/2
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3 Answers By Expert Tutors
Inactive Tutor answered • 10/23/13
Tutor
New to Wyzant
All you have to do is multiply both sides by 2, which will leave M = to the answer when you multiple -7 by 2.
Inactive Tutor
I am still here!
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10/23/13
Inactive Tutor
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
Inactive Tutor
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
Inactive Tutor answered • 10/23/13
Tutor
New to Wyzant
Remember that multiplying NEGATIVE TIMES A NEGATIVE RESULTS IN A POSITIVE. Dividing 2 numbers that are negative also result in a positive.
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
Inactive Tutor
-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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Andrea T.
10/23/13