First slide
Introduction to 3-D Geometry
Question

If Q is the image of  P(-1,2,-3) with respect to the  yz- plane then the distance PQ is

Easy
Solution

The distance from the point P(x1,y1,z1) to the yz- plane is x1

The distance from the point  P(-1,2,-3)  to yz- plane is 1

Therefore, If Q is the image of  P(-1,2,-3) with respect to the  yz- plane then the distance PQ is 2

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