Q&A #19812

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

T2T || FAQ || Teachers' Lounge || Browse || Search || T2T Associates || About T2T

View entire discussion
[<< prev] [ next >>]

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

Post a reply to this message
Post a related public discussion message
Ask Teacher2Teacher a new question

[Privacy Policy] [Terms of Use]

Math Forum Home || The Math Library || Quick Reference || Math Forum Search

Teacher2Teacher - T2T ®
© 1994- The Math Forum at NCTM. All rights reserved.