For a straight line, the slope between any two points are equal.
What is slope ?
Slope is a notation that shows that a surface of which one end or side is at a higher level than another surface.
Let the first pair is, A(-6,-2) and B(-4,-1)
The slope of AB = -1-(-2)/(-4-(-6)) = 1/2
Let the second pair is, B(-4,-1) and C(0,1)
The slope of BC = 1-(-1)/0-(-4) = 2/4 = 1/2
Let the second pair is, C(0,1) and D(2,2)
The slope of CD = 2-1/2-0 = 1/2
The slope of all pairs of point is equal.
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