Hi there! The answer is -2.
We can find the slope of a formula by using the following formula:
[tex]slope = \frac{change \: of \: y}{change \: of \: x} =\frac{y2 - y1}{x2 - x1}[/tex]
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.
[tex]slope = \frac{ - 5 - 3}{1 - - 3} = \frac{ - 8}{4} = - 2[/tex]
Therefore, the third answer is correct.
~ Hope this helps you!