answer is y = -4x - 2
steps
y2-y1/x2-x1 is slope
(-50 - (-30))/12-7
-20/5
-4 = slope
line formula
y - y1 = m (x - x1)
y - (-30) = -4 (x - 7)
y + 30 = -4x + 28
y = -4x - 2
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