Find the center and the length of a radius of the circle.x2 + y2 - 2x - 6y + 1 = 0
A. (–1, –3), r = 3
B. (3, –1), r = 6
C. (1, 3), r = 6
D. (3, 1), r = 3
E. (1, 3), r = 3
Answer: E
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Find a rectangular equation for the curve and describe the curve.x = 
, y = t - 3; -3 ? t ? 3
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