Explanation:
Slope , m , betwen the two points
(y1-y2) / (x1-x2) = (-2 -2) /(5-7) = -4/-2 = 2
SO y = mx + b form would be
y = 2x + b
sub in one of the points to calculate 'b'
-2 = 2(5) + b shows b = -12
so equation is y = 2x -12
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