Question

please answer the question highlighted in red colour.

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Answer 1

Answer:

k= 14

Step-by-step explanation:

The pair of lines equation

3x + 7y - k = 0

12x + 2ky - (4k + 1) = - 0

Here ,a1 = 3 , b1 = 7 , c1 = - k

and a2 = 12 ,b2 = 2k , c2 = -( 4k + 1)

These system has not solution if

a1/a2 = b1/b2 not equal to c1/c2

= 3/12 = 7 /2k not equal to -k / - (4k + 1)

= 1/4 = 7 /2k = k/4k + 1

= k = 4