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the positions of two particles A and B are P1 (3,4) in meters and P2 ( -3, -4 ) meters respectively.
Meters the position A with respect to B is:

P2(-3,-4), P1(3,4).

P1 - P2:
X = 3-(-3) = 6 Meters.
Y = 4-(-4) = 8 Meters.

(X,Y) = (6,8).