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straight lines (Question)

raghu1 said – Fri, 21 Aug 2009 08:32:24 -0000 ( Link )

The product of the slopes of the lines parallel to x-axis and y-axis is not equal to (-1).Why?

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  1. djchalil said – Fri, 21 Aug 2009 12:49:33 -0000 ( Link )

    The slope of the line parellel to x-axis is considered to be 0. The slope of the line parellel to y-axis is not defined or infinity. Their product is not obviously ‘-1’. That’s it!

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  2. Sureshbala said – Fri, 28 Aug 2009 02:03:19 -0000 ( Link )

    Yes, djchalil gave the correction explanation.

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  3. ANKIT PANDE said – Sat, 03 Oct 2009 16:32:03 -0000 ( Link )

    if m1m2=-1 ,then lines are perpendicular to each other,

    but,if lines are perpendicular to each other then it is not necessary that m1m2=-1.

    because, another condition of perpedicularity is that m1=0&m2=1/0.

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