The slope of a line that passes through two points is (difference in y) / (difference in x).
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Points: (-1, -3) and (-9, 7) Slope: -5/4
Points: (3, 15) and (5, 9) Slope: -3
Write an equation in slope-intercept form for the line that passes through the given point and is parallel to the given line (-7,3); x=4
The slope is -2/3.
Points: (-12, -17) and (21, 5) Slope: 2/3