Question 1163472
.


As posted, the problem formulation is  INCORRECT  or at least confusing.


To be correct and clear,  it  MUST  SAY  at the very beginning that the points  X,  Y  and  Z  are in one vertical plane.



-------------


As a reminder :   we live in  3D-space.



/\/\/\/\/\/\/\/


John,  before argue with me,  PLEASE  read my post from the beginning to the end.


I said  "in one vertical plane."


Do you see the difference  ?