Question 1125618


 the slope of a line parallel and perpendicular to {{{y=-x+7}}}

{{{y=-1*x+7}}}-> this line have a slope {{{m=-1}}}

the slope of a line parallel to this line will be same: {{{m=-1}}}

the slope of a line perpendicular to this line will be negative reciprocal to {{{m=-1}}}, and it is {{{m=-1/(-1)}}}->{{{m=1}}}