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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