Which of the following pairs of straight lines intersect at right angles?

  • A
    $2 x^2 = y(x + 2 y)$
  • B
    $(x + y)^2 = x(y + 3 x)$
  • C
    $2 y(x + y) = x y$
  • D
    $y = \pm 2 x$

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