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प्रश्न
Find the slope of the following lines which pass through the point: (2, 3), (2, – 1)
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उत्तर
Let E = (2, 3) = (x1, y1) and F = (2, – 1) = (x2, y2)
Since x1 = x2 = 2
∴ The slope of EF is not defined. ...[EF || y – axis]
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