Answer
The slope is $-\dfrac{3}{5}$.
Work Step by Step
If we have two points, we can find the slope with the following formula:
$$m = \frac{y_2 - y_1}{x_2 - x_1}$$
Let us substitute the $x$ and $y$ coordinates of the given points into the formula:
$$m = \dfrac{-3 - 0}{5 - 0}$$
Let us simplify using subtraction:
$$m = \dfrac{-3}{5}= -\dfrac{3}{5}$$
The slope is $-\dfrac{3}{5}$.