Question

(ii) For what values of x the following three points are collinear ?
(1, -1), (2,1),(x, 5).
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Answer 1

Answer:

4

Step-by-step explanation:

for collinear point, area of triangle will be 0

1[1-5]+2[5-[-1]]+x[-1-1]=0

[-4]+12+[-2]x=0

8-2x=0

x=8/2

x=4