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Two parabola have the same focus. If their directrices are the x-axis and the y-axis respectively, then the slope of their common chord is :A. `pm1`B. `4//3`C. `3//4`D. none of these |
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Answer» Correct Answer - A (1) Let the focus be (a,b). The equation are `S_(1):(x-a)^(2)+(y-b)^(2)=x^(2)` `S_(2):(x-a^(2))+(y-b)^(2)=y^(2)` Common chord `S_(1)-S_(2)=0` gives `x^(2)-y^(2)=0` `ory=pmx` |
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