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You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2