In a rectangular coordinate system, lines r and h both pass through the point (1,-1). The product of the slope of line r and line h is -1. The x-intercept of line r is 3. What is the coordinate of the intersection of line h with the x-axis?
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A0.5
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B1
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C2
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D(0.5,0)
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E(2,0)
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正确答案: D