If Q is the image of P(-1,2,-3) with respect to the yz- plane then the distance PQ is
1
2
3
4
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