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Question
O is the origin and A is the point (3,4). If a point P moves so that the line segment OP is always parallel to the line segment OA, then the equation to the locus of P is   
Options:
A .  4x - 3y = 0
B .  4x + 3y = 0
C .  3x + 4y = 0
D .  3x - 4y = 0
Answer: Option A
:
A
Since OA and OP will be parallel only when O, A and P are collinear.
Therefore,
001341xy1
= 0 4x - 3y = 0.

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