Show that the points A(0,1) B(2,3) C(3,4) are collinear
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the points are col-linear the area must be = 0
(0,1) ( 2,3) ( 3,4)
x₁=0 , y₁ =1
x₂ = 2 ,y₂=3
x₃ = 3, y₃=4
area of the triangle = 1/2 (x₁ [y₂-y₃]+x₂[y₃-y₁]+x₃[y₁-y₂])
= 1/2( 0 * (3-4) + 2*(4-1) + 3(1-3))
= 1/2[ 2*3+3*-2]
= 1/2 [ 6 - 6]
= 1/2*0
= 0
these points are col linear
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