Answer
$-1$
Work Step by Step
The equation for slope is: $ \frac{y_{2}-y_{1}}{x_{2}-x_{1}}$. This means we take the y value of the second point and subtract it by the y value of the first point, and then we divide this by the x value of the second point minus the x value of the first point. Thus, we obtain:
$\frac{3-4}{5-4}=-\frac{1}{1}=-1$
