The slope of the line below is -4. Use the coordinates of the labeled point to find a point-slope equation of the line.
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Point slope form says the line with slope m through point (a,b) is
y - b = m(x - a)
Here m-4 and (a,b)=(4,-9) so our line is
y + 9 = -4(x - 4)
which is
Answer: B