Instructions

1

Identify the points' coordinates. For this example, imagine that the points have coordinates of (2, 8) and (4, 3).
2

Subtract the second point's y-coordinate from the first's: 8 - 3 = 5.
3

Subtract the second point's x-coordinate from the first's: 2 - 4 = -2.
4

Divide the difference between the y-coordinates by the difference between the x-coordinates: -2 ÷ 5 = -0.4. This is the line's slope.