RRB Group D 10-Dec-2018 Shift 1 Solved Paper

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Question : 66 of 100

Marks: +1, -0

If the equations

20x + 5y+ 11 = 0

and

5 0 x -k y -9 = 0

have no solution, then the value of

k

is:

18
12.5
-12.5
-18

Solution:

20x+5y+11=0

50x-ky-9=0

have no solution then both the line are parallel

{20}/{50}=5/{-k}={11}/9

k={-50×5}/{20}=-12.5

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