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The slope formula is given by:
m = (y2 - y1) / (x2 - x1)
Using the given points (5,0) and (4,9), we can substitute these values into the slope formula:
m = (9 - 0) / (4 - 5)
m = 9 / -1
m = -9
The slope is -9, and therefore, option A. -9 is the correct answer.
Describing the slope as negative.