find the value of x for which the points (x,-1) (2, 1) and (4 ,5)
are collinear
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Answer:
x = 1
Step-by-step explanation:
Given, points (x,-1) (2, 1) and (4 ,5)
are collinear
=> area = 0
=> ½ { x [ 1 - 5 ] + 2 [ 5 - ( -1 ) ] + 4 [ -1 - 1 ] } = 0
=> -4x + 2(6) + 4(-2) = 0
=> 4x = 12 - 8
=> x = 4 / 4 = 1
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