# How do you find the slope of the line that is (a) parallel and (b) perpendicular to the line through the pair of points: (-5, -10) and (0, 0)?

##### 1 Answer

Apr 14, 2015

The slope of a straight line through

All parallel straight lines share the same slope.

so the slope of a line parallel to a line through

The slope of a line perpendicular to a line with slope

or, in this case,