# x1, x<

Let the common difference between the x - coordinate be dx , between the y - coordinate be dy

The three points can be written in terms of their common difference as (x1, y1), (x1 + dx, y1 + dy), (x1 + 2dx, y1 + 2dy)

Slope of first two points

Slope of first two points

Slope of last two points

Slope of last two points

Since the slope of first two points and last two points are same hence they are on the same line.

Hence proved

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