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Write the equation of a circle with a center at that is tangent to the y-axis (in other words, it touches the y-axis at only one point). Sketching a picture will help.

Since the circle is tangent to the y-axis, the length of the radius will be equal to the distance from the center to the y-axis.

Use the eTool below to graph the equation.
Click the link at right for the full version of the eTool: CCA2 5-30 HW eTool