
Sender: Jimmy Lumpkins
Subject: Pre calculus
Need a method for solving the following problem: Find
the equation of a line through point P that is parallel or perpendicular
to another line.
Hi Jimmy,
 Find the slope of the given line (rearrange into y=mx+b
form and then the slope is m)
 If the new line is to be parallel to the given line
set its slope to m. If it is to be perpendicularto the given line set
its slope to 1/m
 Use the formula yy1=m(xx1) where x1 and y1 are the
coordinates of P m was calculated in 2 and x,y are the variables of
the line.
Cheers,
Paul.
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