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Centre of circle: (4, -2)

Slope of tangent: 1

Slope of radius: -1

Radius equation: y--2 = -1(x-4) => y = -x+2

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โˆ™ 2017-04-08 12:14:47
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A polynomial of degree zero is a constant term

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โˆ™ 2017-04-08 12:38:27

The equation for the radius which intersects the tangent is x + y = 2.

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Q: What is the radius equation of the circle x2 plus y2 -8x plus 4y equals 30 when touched by the tangent line y equals x plus 4?
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