In this problem the input is the coordinate of the three points in a XY plane?

P1(X1,Y1)

P2(X2,Y2)

P3(X3,Y3)

how can we find out if all the three points are on the same line or not?

for example the points (1,1) , (-1,-1) , (0,0) are on the line y=x.

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