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Question
Find the joint equation of the line which are at a distance of 9 units from the Y-axis.
Solution
Equations of the lines, which are parallel to the Y-axis and at a distance of 9 units from it, are x = 9 and x = - 9
i.e. x - 9 = 0 and x + 9 = 0
∴ their combined equation is
(x - 9)(x + 9) = 0
∴ x2 - 81 = 0
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