(Section 0.13: The Cartesian Plane and Circles) 0.13.4 Example 1 (The Graph of an Equation; A Circle Centered at the Origin)The graphof x2+y2=9is the circlebelow with center0, 0()and radius3. The ordered pairs3, 0, ±, 0, 3, and 0,±3are all solutionsof the equation x2+y2=9, and their corresponding pointslie on the circle. Other points such as 7,2also lie on the circle. §Equation of a Circle with Center
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