An engineer must ensure a pipe follows a line with slope $-\frac{1}{4}$ that passes through the point $(8,4)$. She begins plotting the line starting at the given point $(8,4)$. Using the slope, she moves three runs to the left, where the denominator of the slope represents the run and one run equals $4$ units. What is the coordinate of the new point?

• A. (−4, 1)
• B. (20, 1)
• C. (-4, 7)
• D. (−8, 7)

Answer: (C)