The joint equation of the straight lines $x + y = 1$ and $x - y = 4$ is

  • A
    $x^2 - y^2 = -4$
  • B
    $x^2 - y^2 = 4$
  • C
    $(x + y - 1)(x - y - 4) = 0$
  • D
    $(x + y + 1)(x - y + 4) = 0$

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