SOLUTION: Find the value of r so that the line passing through (-2,-10)and (r,12) has the slope of -11

Algebra ->  Coordinate-system -> SOLUTION: Find the value of r so that the line passing through (-2,-10)and (r,12) has the slope of -11      Log On


   

Question 369480: Find the value of r so that the line passing through (-2,-10)and (r,12) has the slope of -11
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use the formula for slope,
m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29
%2812-%28-10%29%29%2F%28r-%28-2%29%29=-11
%2812%2B10%29%2F%28r%2B2%29=-11
-11%28r%2B2%29=22
r%2B2=-2
highlight%28r=-4%29