What are the equations for finding out the slope of a line perpendicular to a given line & the slope of a line parallel to a given line?

Question

anonymous · Answer

the slope of a line can be found out by
if uve got 2 points onb the line (x1,y1) and (x2,y2)
the slope of the line is 
(y2 - y1)/(x2-x1)

anonymous · Answer

now if the slope of one line is m, then

1. Slope of perp line = -1/m
2. Slope of || line =m

anonymous · Answer

Ohh I get it now. So the || line has the same slope as the line given & the perpendicular line is the opposite?

anonymous · Answer

the perp has the negative of the reciprocal

anonymous · Answer

Yeah that's what I meant. Thank you so much. I have to do this summer packet & I just needed something to refresh my memory of my previous algebra classes. Thanks.

anonymous · Answer

no problem