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Question

Question 7
If the lines given by 3x + 2ky = 2 and 3x + 5y = 1 are parallel, then the value of k is
(a) 54
(b) 12
(c) 154
(d) 32

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Solution

Answer - C

Condition for parallel lines is
a1a2=b1b2c1c2
Given 3x + 2ky – 2 = 0
And 2x + 5y – 1 = 0
Here, a1=3, b1=2k, c1=2
and a2=2, b2=5, c2=1

From Eq (i), 32=2k5
k=154

Also, c1c2=21=2

Thus, a1a2=b1b2c1c2


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