Question 1086074


{{{3x-9y=-7}}} 

{{{3x+7=9y}}} 

{{{y=(3/9)x+7/9}}} 

{{{y=(1/3)x+7/9}}} -> the slope of this line is {{{(1/3)}}}

 the slope of a line perpendicular to this line will be negative reciprocal:

{{{-(1/(1/3))=-3}}}


and the slope of a line parallel to this line will be same:  {{{(1/3)}}}