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If you mean points of (3, 6) and (1, -2) then the slope is 4
Points: (-1, -11) and (-6, -7) Slope: -4/5
0). Considering any TWO points, you can calculate the slope of the line between them like this: Slope = (difference between the y-values of the two points) divided by (difference between the x-values of the two points). Use this technique to examine your THREE points, like this: 1). Calculate the slope of the line between Point-2 and Point-1. 2). Calculate the slope of the line between Point-3 and Point-1. 3). If the two slopes are equal, then the three points all lie on the same line.
Points: (-1, -1) and (0, 0) Slope: 1
Points: )1, 1) and (3, 3) Slope: 1