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Q&A #19812

Teachers' Lounge Discussion: Explaining concept -x=2 is equal to x=-2

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From: Robert

To: Teacher2Teacher Public Discussion
Date: 2009092109:43:19
Subject: Re: math

3d+ 16= d-4; Subtract d from both sides, 3d-d+16= d-d-4; get 2d+16= -4;Subtract 16 from both sides,2d+16-16= -4-16 and get 2d=-20;devide both sides by 2 ,2d/2=-20/2;result is d= -10. I hope this helps. Robert

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