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

The ordered pair must lie in either quadrant II or quadrant IV. This is because the x-coordinate and y-coordinate of the ordered pair have opposite signs, which means that one coordinate must be negative and the other must be positive. Quadrant II has both negative x- and y-coordinates, while quadrant IV has both positive x- and y-coordinates.