Given that the line contains
is perpendicular to
; 
Find the slope of
.
Let
be
and
be
.
(Slope formula)
(Substitute
)
(Simplify)
The product of slopes of two perpendicular lines is
.
Since
.
So, the line perpendicular to
have the slope 2.
Graph the line.
\Start at
, move up 2 units and then right 1 unit.
Label the point B. Draw
.
_using_slope_2.gif\")
The graph is
\_using_slope_2.gif\")