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The tangent line to a straight line, such as y = 2x - 3, is the straight line, itself.

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Q: What is the tangent line of 2x-3 at point -15?
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What is the length of the tangent line from the point 8 2 to a point where it meets the circle x2 plus y2 -4x -8y -5 equals 0?

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