Question 1129367
A circle touches the x axis at the point P(-3,0) and its center C lies on the line 2x+y+1=0. Find: 
(a)coordinates of C 
(b)radius of the circle 
(c)equation of the circle
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"touches" means tangent.
--> the radius is on the line perpendicular to the x-axis thru the point (-3,0)
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The intersection of the 2 lines is the center.
etc.