To plot a point at the location (-21/2, -4) on a coordinate plane, count 21 units to the left and 4 units downward from the origin.
To plot a point at the location (-21/2, -4) on a coordinate plane, start by locating the x-coordinate, which is -21/2. Since -21/2 is negative, count 21 units to the left from the origin. Then, locate the y-coordinate, which is -4. Since -4 is negative, count 4 units downward from the origin. The point where the x and y coordinates intersect is the location of the plotted point (-21/2, -4).
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