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Question

Find the equation of line passing through (2,5) and making intercepts equal in the magnitude but opposite in sign on both the axes.

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Solution

Let x-intercept of the line be a.
Then, y-intercept of the line is a.
Equation of the line using double intercept form is xa+y(a)=1
xaya=1
i.e. xy=a ...(1)
This line passes through the point (2,5)
25=a
i.e. a=3
From (1), equation of the line is xy=3
i.e., xy+3=0.

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