1.

If the foot of the perpendicular from the origin to a straight line isat `(3,-4)`, then find the equation of the line.

Answer» Correct Answer - 3x-4y=25
Let P(3,-4) be the foot of the perpendicular from the origin O on the required line. Then the slope of OP is
`(-4-0)/(3-0) = -(4)/(3)`
Therefore, the slope of the required line is 3/4.
Hence, its equation is
`y+4 = (3)/(4)(x-3)`
or 3x-4y = 25


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