Algebra.Com's Answer #657475 by ikleyn(52781)![\"\"](\"/images/stars/stars-13.gif\")  
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document.write( "I think this is the correct area for this, being as it has to do with graphs. I need help graphing a circle,
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document.write( "but my graphing calculator refuses to let me equal the equation to 15 instead of Y.
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document.write( "Could anyone please explain how to graph this: x^2+y^2=15 ? I know it seems very simple, but I'm stuck!
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document.write( " = 15\r\n" );
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document.write( "is the circle with the center at the origin of a coordinate system with the radius r =  .\r\n" );
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document.write( "In general, if you have an equation  =  , it desrcibes a circle with the center at the point (h,k) and the radius of  .\r\n" );
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document.write( "You can express y =  from the equation.\r\n" );
document.write( "May be, your calculator is able to plot these functions\r\n" );
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document.write( "y = and y = -,\r\n" );
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document.write( "that represent the upper and the lower parts of the circle?\r\n" );
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