Since we are finding the slope, we have to do the rise over run strategy. In this case, rise (y) are the numbers -3 and 1 and the run (x) is the numbers -6 and 4. After that, we subtract them. So, -3 - 1 and -6 - 4. We get -4 over -10 (or - 4/10) which is your slope.
Pretty sure it's a, because you only want a small sample size and few people. Also you want many trials because you need to know of it works. Was <em>I right?</em>
