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OpenStudy (anonymous):
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Directrix (directrix):
2x - y + 2z = -15 --> Multiply equation by 1 --> 2x - y + 2z = 15 2x - 2y - z = 1 --> Multiply the equation by 2 -->4x -4y - 2z = 2 ---------------- Add -------->6x -5y = 17
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