Point slope form:
y-y1 = m (x-x1)
Where:
(x1,y1) = (-5,9)
(x2,y2) = (1,3)
Replacing:
y-9 = m (x-(-5))
y-9 = m (x+5)
Replace x,y by point 2, and solve for m
3-9 = m (1+5)
-6 = 6 m
-6/6 = m
m= -1
final equation:
y-9 = -1 (x+5)
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