When are two vectors, x1y2 = x2y1

Two vectors are parallel

If a is not equal to B, then (x2-x1) / (y2-y1)=

Because of the arithmetic sequence, b-x2 = x2-x1 = x1-a, we get x2-x1 = (B-A) / 3
And b-y3 = y3-y2 = y2-y1 = y1-a, y2-y1 = (B-A) / 4
So (x2-x1) / (y2-y1) = 4 / 3

Plane vector a = (x1, Y1) B = (X2, Y2) where a and B refer to two coordinate points or what?

It's the vector OA, ob, not the coordinates

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