Solve this following


Let $a, b \in R$. If the mirror image of the point $P(a$, 6,9 ) with respect to the line

$\frac{x-3}{7}=\frac{y-2}{5}=\frac{z-1}{-9}$ is $(20, b,-a-9)$, then $|a+b|$

is equal to :


  1. 88

  2. 86

  3. 84

  4. 90

Correct Option: 1,




$Q=(20, b,-a-9)$



$\Rightarrow \mathrm{a}=-56$ and $\mathrm{b}=-32$



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