The slope of the line through the points $(2,6)$ and $(3,8)$ is . The slope of the line through the points $(9,5)$ and $(2,7)$ is . The slope of the line through the points $(-4,6)$ and $(5,7)$ is . The slope of the line through the points $(-8,-6)$ and $(-2,-5)$ is .
Hint: The slope of a line is the ratio of rise and run. Draw a picture if necessary.