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April 7th, 2010, 08:27 PM  #1 
Newbie Joined: Apr 2010 Posts: 24 Thanks: 0  Circle equation
I have to find the equation of the tangent to the circle with equation x^2 + y^2 = 8 at the point (2,2) I'm just not sure how to use the point to form the equation, please help and in advance many thanks for your time and effort. 
April 8th, 2010, 04:46 AM  #2 
Senior Member Joined: Feb 2010 Posts: 711 Thanks: 147  Re: Circle equation
One of the standard forms for a straight line is the pointslope form. To use this form you need to know a point on the line and the slope of the line. You have a point. To get the slope, notice where the point (2,2) is located. You should be able to get a slope for a radius of the circle and from that you can get the slope of the line you want. MrTwhs 

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