(a) Plot the points (3, 2), (4, −1), (−2, 3), and (−5, −4).
(b) Change the sign of the y-coordinate in each of the points in part (a), and plot these new points.
(c) Explain how the points (a, b) and (a, −b) are related graphically. [Hint: What are their relative positions with respect to the x-axis?]
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