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Question

If the lines given by 3x+2y=2 and 2x+5y+1=0 are parallel then the value of k is

(a) 54 (b) 25 (c) 32 (d) 154

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Solution

Condition for two lines a1x+b1y+c1=0 and a2x+b2y+c2=0 to be parallel is

a1a2=b1b2c1c2

Given lines are 3x+2y=2 and 2x+5y+1=0

a1=3,b1=2k,c1=2,a2=2,b2=5,c2=1

Using these values,

32=2k54k=15k=154


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