Answer:
Y plane at y=3/2 contains all the points which will be equidistant from both points P and Q.
Explanation:
As the complete question is not readable, the question is found online and is attached herewith.
By the distance formula, as the point R with coordinates x,y,z is equidistant from P and Q thus

So the y plane at y=3/2 contains all the points which will be equidistant from both points P and Q.