SSC CGL 9 Aug 2015 Shift 1 Paper

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Question : 137 of 200

Marks: +1, -0

2x – ky + 7 = 0 and 6x – 12y + 15 = 0 has no solution for

k = – 1
k = – 4
k = 4
k = 1

Solution:

For pair of equations,

a_1x + b_1y + c_1

= 0

a_2x + b_2y + c_2

= 0,
there is no solution if

a_1/a_2

=

b_1/b_2

≠

c_1/c_2

∴

2/6

=

-k/{-12}

⇒

1/3

=

k/{12}

⇒ k =

{12}/3

= 4

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