Posted by nelly on Tuesday, January 10, 2012 at 12:15pm.
True or False:
•Every equation of the form
X^2+y^2+ax+by+c=c
•The radius of the circle
x^2+y^2=9 is 3
•The center of the circle
(X+3)^2+(y2)^2=13 is (3,2)

PreCalc  Damon, Tuesday, January 10, 2012 at 12:30pm
I do not know what the first one is supposed to be, either a typo or totally false
The second is true
the third has the signs backwards, should be (3 ,2)

PreCalc  Steve, Tuesday, January 10, 2012 at 12:45pm
Looks like the first one is intended to be the equation of a circle.
(x^2 + ax) + (y^2 + by) = 0
Unfortunately, if a or b is not zero, there is no real graph.
If a=b=0, then the graph is just the point (0,0).
If there was a typo, giving a "d" on the righthand side, then given suitable a,b,c,d there will be a circle that satisfies the equation.

PreCalc  nelly, Tuesday, January 10, 2012 at 5:49pm
Oh yes the first one was a typo it was supposed to be X^2+y^2+ax+by+c=0
Answer This Question
Related Questions
 MATH HELP MS SUE OR SOMEONE  Is the following statement true or false? Justify ...
 math  Is the following statement true or false? Justify your answer using what ...
 PreCalc (Circles)  Describe the conditions necessary, where circle A has a ...
 pre calculus  Write the equation of the circle in standard form. Find the ...
 Math  The points (4, –5) and (– 4, 1) are endpoints of a diameter of a circle...
 college precalculus  4x^2+4y^216x24y+51=0 is the equation of a circle. where...
 NEED MAJOR HELP! *QUADRATIC EQUATIONS*  Write the equation for the circle with ...
 pre calc  find the equation of a circle with. Center (0,0), radius 2
 PreCalc  Describe the conditions necessary for the two circles, where circle a...
 Advanced Math  Write the standard form of the equation of a circle that passes ...
More Related Questions