Answer:
The slope of line passes (x1, y1) and (x2, y2) could be calculated by:
slope = (y2 - y1)/(x2 - x1)
=>A line passes (5, 1) and (2, -2) has the slope:
slope = (-2 - 1)/(2 - 5) = (-3)/(-3) = 1
Hope this helps!
:)
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