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Hi,
Find the slope of the line through each pair of points:

(5,-4),
(-20,-3) m = -1/25
y = (-1/25)x + b ||Using Pt(5,-4) to solve for b
-4 = (-1/25)5 + b
-19/5 = b
y = (-1/25)x -19/5 or in standard Form: x + 25y = -95