1.

For what value of x are the points (1,5), (x,1) and (4,11) collinear?1. 12. 23. 34. -1

Answer» Correct Answer - Option 4 : -1

Calculation:

Area of the triangle formed by given points

\(\frac{1}{2}\) |1(1-11) + x(11-5) + 4(5-1)|

\(\frac{1}{2}\)|6x + 6|

= 3 |x + 1|

The given points are collinear iff area of triangle = 0
i.e, iff 3 |x + 1| = 0
i.e, x + 1 = 0 iff x = -1
Hence the required value of x is -1.


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