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.


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