Question

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Answer 1

Answer is option A

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Answer 2

Question :

The points ( k - 1  ,  k + 2 ) , ( k , k + 1 ) , ( k + 1 , k ) are co-linear for what value of k ?

Answer:

OPTION A

Step-by-step explanation:

Slope of ( k - 1 , k + 2 ) and ( k , k + 1 )

Slope = ( k + 1 - k - 2 ) / ( k - k + 1 )

          = - 1 / 1

          = - 1

Slope of ( k , k + 1 ) and ( k + 1 , k )

- 1 = ( k - k - 1 ) / ( k + 1 -  k )

= > - 1 = - 1 / 1 = - 1

For any value of k the equation will be satisfied.

Hence OPTION A is correct .