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Q.

The equation of image of pair of lines y = x-1 in y-axis is …..

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a

x2 + y2 + 2x - 1 = 0

b

x2 - y2 + 2x - 1 = 0

c

x2 - y2 + 2x + 1 = 0

d

x2 + y2 + 2x + 1 = 0

answer is C.

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Detailed Solution

y = x-1
y2 = (x-1)2
Change x by –x
y2 = (-x-1)2
y2 = x2 + 2x + 1
x2 - y2 + 2x + 1 = 0

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