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These points are not collinear
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the points are not collinear
Step-by-step explanation:
A ( 1 , 5 )
B ( 2 , 3 )
C ( -2 , -11 )
therefore area ( ∆ ) = 1/2 [x1(y2 - y3) + x2(y3 - y1) + x3(y1 - y2)]
0 = 1/2 [ 1 ( 3 - (- 11) ) + 2 (- 11 - 5) + (- 2) (5 - 3) ]
0 = 1/2 [1 (14) + (-32) -4]
0 = 1/2 [14 - 32 - 4]
0 ≠ -7
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