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Question

The perpendicular from the origin to a line meets it at the point (2,9), find the equation of the line.

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Solution

Slope of the perpendicular from the point(2,9) on the line is,

m=92

Let the slope of the required line be m1, then,

mm1=1

m1=29

Then the equation of line passing through the point (2,9)and having slope29 is given by,

y9=29(x+2)

9y81=2x+4

2x9y+85=0


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