unit vectors: solving with component method and graphical method

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P and Q are vectors in the X , Y plane, have the same magnitude, and are perpendicular to each other. If Q=3.0i+4.0j. What is P?

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I dont know if this is right. My answer is P= -4.0 i + 3.0 j or P= 4.0 i - 3.0 j ?