

InterviewSolution
Saved Bookmarks
1. |
Line through the points (-2,6) and (4,80 is perpendicular to the linethrough the points (8,12) and `(x , 24)dot`Find the value of `xdot` |
Answer» Let A(-2,6), B(4,8), C(8,12) and D(x,24) be the given points. Let `m_(1) and m_(2)` be the slopes of AB and CD respectively. Then, `m_(1)="slope of AB"=((8-6))/(4-(-2))=(2)/(6)=(1)/(3)` `m_(2)="slope of CD"=((24-12))/((x-8))=(12)/((x-8))` `"Now", AB CD Leftrightarrow m_(1)m_(2)=-1` `Leftrightarrow (1)/(3)xx(12)/((x-8))=-1` `Leftrightarrow -x+8=4 Leftrightarrow x=4` Hence, the required value of x is 4. |
|