To determine the rate (or slope) of the line that passes through the points (0, 0) and (4, -6) on the coordinate plane, we can use the formula for slope:
\[ \text{slope} (m) = \frac{y_2 - y_1}{x_2 - x_1} \]
Here, let \((x_1, y_1) = (0, 0)\) and \((x_2, y_2) = (4, -6)\).
Substituting the values into the formula:
\[ m = \frac{-6 - 0}{4 - 0} = \frac{-6}{4} = -\frac{3}{2} \]
Thus, the rate (slope) of the graph is \(-\frac{3}{2}\).