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 Algebra Pre-Algebra and Basic Algebra Math Forum

 June 2nd, 2009, 03:48 PM #1 Newbie   Joined: Jun 2009 Posts: 5 Thanks: 0 confused with math homework! please help! 1.) If m/n=1/3, which of the following must be true? I. 3m=n II. m=3n III. m+1=(n+3)/3 IV. mn=3 (1) I only (2) I and II only (3) I and III only (4) I and IV only
 June 2nd, 2009, 09:00 PM #2 Global Moderator   Joined: Dec 2006 Posts: 21,036 Thanks: 2274 Try using m = 2 and n = 6.
 June 3rd, 2009, 04:33 AM #3 Newbie   Joined: Jun 2009 Posts: 5 Thanks: 0 Re: confused with math homework! please help! thank you!
 June 3rd, 2009, 06:26 AM #4 Senior Member   Joined: Jul 2008 Posts: 895 Thanks: 0 Re: confused with math homework! please help! In future it might be helpful if you "cross multiply": IF a/b = c/d, THEN ad = bc etc.

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