SOLUTION: Circle O has a center at (-1,1) and the line SL is tangent to circle O at S (-4,2). Write an equation for the line SL. I believe that you have to find the slope. But after that???

Algebra ->  Graphs -> SOLUTION: Circle O has a center at (-1,1) and the line SL is tangent to circle O at S (-4,2). Write an equation for the line SL. I believe that you have to find the slope. But after that???      Log On


   

Question 448704: Circle O has a center at (-1,1) and the line SL is tangent to circle O at S (-4,2). Write an equation for the line SL.
I believe that you have to find the slope. But after that?????
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
a tangent is perpendicular to the radius at the point of tangency ___ SL is perpendicular to OS

find the slope and use point-slope to write an equation