Homework Help: Math

Posted by Anonymous on Saturday, October 24, 2009 at 1:59pm.

Determine whether the statement is true, false, or sometimes true. Explain or show why.
If x is positive and y = -x, then xy is negative.

Is this always true or sometimes true?

Math - LALA, Saturday, October 24, 2009 at 3:20pm
False. If x is positive and you put a negative in front of it, you have to divide by negative one which would then give you positive x again. If you multiply a positive x and a positive y then xy is positive. False. Hope that helps.!!!:)
Math - PsyDAG, Sunday, October 25, 2009 at 11:51am
If y = -x, the xy = x(-x).

What do you get when you multiply a positive by a negative?

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