SOLUTION: The line passing through ​(−1​,y) and ​(1,0​) is perpendicular to the line joining ​(4,4​) and (−2,1). Find y.

Algebra ->  Coordinate-system -> SOLUTION: The line passing through ​(−1​,y) and ​(1,0​) is perpendicular to the line joining ​(4,4​) and (−2,1). Find y.      Log On


   

Question 1079964: The line passing through ​(−1​,y) and ​(1,0​) is perpendicular to the line joining ​(4,4​) and (−2,1). Find y.
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
Slope of line containing (4,4) & (-2,1):
%284-1%29%2F%284-%28-2%29%29
3%2F6
1%2F2


Slope of line containing (-1,y) & (1,0), to be perpendicular, must be -2, negative reciprocal of the other line.


%28y-0%29%2F%28-1-1%29=-2

y%2F%28-2%29=-2

highlight%28y=4%29