Hi there! The answer is -2.
We can find the slope of a formula by using the following formula:
![slope = (change \: of \: y)/(change \: of \: x) =(y2 - y1)/(x2 - x1)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/j6ani97z98mg8dwy026q9rha056ciwsceo.png)
x2 and y2 don't mean squared, but the x and y coordinate of our second point.
First we need to find two points on the line. Ijn this particular case we have (-3, 3) and (1, -5). Now we can fill in the formula.
![slope = ( - 5 - 3)/(1 - - 3) = ( - 8)/(4) = - 2](https://img.qammunity.org/2019/formulas/mathematics/middle-school/on440k5ujfjo4ejx39yoprnjufwai5f55n.png)
Therefore, the third answer is correct.
~ Hope this helps you!