Question

If P(x,y) and P(y,x) are some points then,which of the following is true (1)x+y=0 ,(2)xy=0,(3)x-y=0,(4)x+y=0

Answer 1

 since both are same point which is only possible when,
(x,y)=(y=x)
=> x=y
=>x-y=0
option 3)

Answer 2

Step-by-step explanation:

There is only one possible

1. x=y
2. x-y = 0