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Math Help - Normal lines.

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    Normal lines.

    For what value of a is the graph of 5y = ax + 7 perpendicular to the graph of by + 3x = 12?
    Last edited by mr fantastic; May 31st 2010 at 06:11 PM. Reason: Re-titled.
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    Quote Originally Posted by sri340 View Post
    For what value of a is the graph of 5y = ax + 7 perpendicular to the graph of by + 3x = 12?
    slopes of perpendicular lines are opposite reciprocals.
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