Question 314250
{{{y=-x+1}}}
{{{ graph( 300, 300, -5, 5, -5, 5, -x+1) }}}
Perpendicular line have slopes that are negative reciprocals.
{{{m1*m2=-1}}}
{{{-1*m2=-1}}}
{{{m2=1}}}
{{{ graph( 300, 300, -5, 5, -5, 5, -x+1,x+1) }}}