When counting slope, you simply have to count the distance traveled to get from one point to another. If we start on the lower point, we move left by two, which is also represented as -2, and then we go up 3, which is positive, so it's 3! :D
Simple random sample: Every member and set of members has an equal chance of being included in the sample. Random samples are usually fairly representative since they don't favor certain members.
