A
If the points (2, 1) and (1, -2) are equidistant from the point (x, y), prove that x + 3y = 0.
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0
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3x=°5 the image is inverted and real if it's below the principal axis and is the same size as the answer in the focal length of a convex lens is 20 the image is inverted and real if it's below the principal axis and is the same size as ו
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3
Answer:
By distance formula on sq
» (x - 2)² + (y - 1)² = (x - 1)² + (y + 2)²
» -4x + 4 - 2y + 1 = - 2x + 1 + 4y + 4
» 2x + 6y = 0
» x + 3y = 0
Hence, proved.
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