#### Answer

The slope of the line is approximately $-4$.

#### Work Step by Step

A line with a positive rises from left to right while a line with a negative slope falls from left to right.
The given line falls from left to right so its slope is negative.
The line contains the point $(0, 0)$ and appears to pass through the point $(1, -4)$.
We solve for the slope using the two points above and the slope formula:
$m =\dfrac{-4-0}{1-0}=\dfrac{-4}{1}=-4$
Thus, the estimated value of the slope of the line is $-4$.