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Math Question

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lauralane | 17:13 Thu 27th Dec 2012 | Quizzes & Puzzles
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Can someone help my nephew with this. I have no idea and can't help him. 9d+4 =5d+12 What on earth is the answer. I am lost.
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Avatar Image sandyRoe
subtract 4 from each side. 9d=5d+8
subtract 5d from each side. 4d=8
d=2
17:15 Thu 27th Dec 2012
Avatar Image Captain2
9d + 4 = 5d + 12
9d - 5d = 12 - 4
4d = 8
d = 2
17:16 Thu 27th Dec 2012
Avatar Image gen2
Sandy's answer is the way it is taught in schools today. (what you do to one side you do to the other)

Captain's answer is the way it used to be taught (change the side - change the sign)
17:20 Thu 27th Dec 2012
Avatar Image sandyRoe
It's 50 years since I was in school. How did I know that?
17:22 Thu 27th Dec 2012
Avatar Image Captain2
Not far behind you either Sandy!
17:23 Thu 27th Dec 2012
Avatar Image Prudie
Captain's way (the old way) is easier to teach them to get the right answer IMO
17:24 Thu 27th Dec 2012
Avatar Image Captain2
Thanks Prudie - but less of the 'old' please
17:25 Thu 27th Dec 2012
Avatar Image gen2
We keep up to date helping our grandchildren.
17:25 Thu 27th Dec 2012
Avatar Image Prudie
Sorry Cap'n I was taking it from Gen2 and it is also my way!
17:26 Thu 27th Dec 2012
Avatar Image lauralane
Question Author
Thanks so much guys. Happy New Year
17:59 Thu 27th Dec 2012

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