If two lines of regression are x+4y+1=0 and 4x+9y+7=0, then what is the value of x when y=-3?

NDA 2023 Mathematics question

If two lines of regression are and , then what is the value of when ?

Answer: (C)

To estimate from we need the line of on . If were the line of on () and the line of on (), then $

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Question ID VK-029637