SOLUTION: What is the equation of a line perpendicular to a line that has a slope of -1 and passes through (-3,9)? I don't even know where to start:( I know a perpendicular line has the nega

Algebra ->  Points-lines-and-rays -> SOLUTION: What is the equation of a line perpendicular to a line that has a slope of -1 and passes through (-3,9)? I don't even know where to start:( I know a perpendicular line has the nega      Log On


   

Question 469624: What is the equation of a line perpendicular to a line that has a slope of -1 and passes through (-3,9)? I don't even know where to start:( I know a perpendicular line has the negative recipricol of the original line's slope (-1).
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

equation of a line perpendicular to a line that has a slope of -1/1 

 New Line:  m = 1

Using the standard slope-intercept form for an equation of a line y = mx + b  where m is the slope and b the y-intercept.  

   y = 1*x + b  |passing through (-3,9)

   9 = -3 +b

  12 = b

Line is:  y = x + 12