Please answer all the parts of first question...

Dear Student,
1.(a). 
Since we need to find the coordinate of the image of (-1,2,-3) in the x-z plane, a sign of its y- coordinate will change
So, Image of  (-1,2,-3)  is  (-1,-2,-3)
​​​​​​
(b).  Since we need to find the coordinate of the image of (-1,2,-3) in the y-z plane, a sign of its x- coordinate will change
So, Image of  (-1,2,-3)  is  (1,2,-3)

(c).  Since we need to find the coordinate of the image of (-1,2,-3) in the x-y plane, a sign of its z- coordinate will change
So, Image of  (-1,2,-3)  is  (-1,2,3) ​​​​​​​

Kindly post other questions in a separate thread.
Regards

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