Answer:
![(4)/(5)](https://img.qammunity.org/2020/formulas/mathematics/high-school/xfv56szu341sgt4xkshjneg6z7o9hs1w3r.png)
Explanation:
Use the slope formula:
![(y1 - y2)/(x1 - x2) = m](https://img.qammunity.org/2020/formulas/mathematics/middle-school/fnll6h90kb59moqvch3qesi0tfuczg784v.png)
*Slope is rise over run, hence y (vertical) over x (horizontal)*
![(5 - 1)/(4 + 1) = (4)/(5)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/npw9d2nmtkudlxwsl6rykxjcrg09av8ygc.png)
Notice that the one in the denominator is positive. This is because the x value for point M is negative one and you're subtracting it from the four. When there are two negative like this, it turns into a positive (+).