Question

The coordinates of an ordered pair have opposite signs. In which quadrant(s) must the ordered pair lie?

Answer 1

If they have opposite signs the point can be in either the second or fourth quadrants.

-x and +y is in the second quadrant

+x and -y is in the fourth quadrant.

Answer 2

Quadrant I= +,+
Quadrant II= -,+
Quadrant III= -,-
Quadrant IV= +,-

so the quadrants with opposite ordered pair are Quadrants II(2), IV(4)