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The interior angle bisector of angle P f...

The interior angle bisector of angle `P` for the trangle `P Q R` whose coordinates of the veetices are `P(-8,5); Q(-15 ,-19)a n dR(1,-7)` has the equation `a x+2y+c=0,` then `(a ,c)=` (a) `a=11` (b) `a=10` (c) `c=78` (d) `c=80`

A

`11x+2y+3=0`

B

`2x-11y+71=0`

C

`11x+2y+78=0`

D

`2x+11y+7=0`

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A
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