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Question

For what values of k will the pair of equations x+2y+7=0, and 2x+ky+14=0 represent coincident lines?

A
3
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B
6
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C
4
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D
9
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Solution

The correct option is C 4
Given system of equations are x+2y+7=0, and 2x+ky+14=0

Condition for coincident lines is

a1a2=b1b2=c1c2

a1=1, a2=2, b1=2, b2=k

12=2k

k=4

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