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Circles have the general equation (x-h)2 + (y-k)2 = r2
where (h,k) will be the center of the circle on a graph and r is its radius.
If the circle is centered at the origin h=k=0 and the equation simplifies into
x2 + y2 = r2
'Solving' implies that you know certain conditions. You substitute those into the appropriate equation and solve for the unknown.
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How do you solve these equations?
Tell me the equations first.
How do you solve multivariable equations?
You need as many equations as you have variables.
How do you solve 3 dimensional equations?
You can solve the system of equations with three variables using the substitute method, or using matrix operations.
Why do you need to be able to solve equations?
If you don't learn to solve equations then guess and check is the only way to arrive at new information.
Why circles are important?
Well, in math you solve the perimeter of circles and such, and learn understanding of them to help you with circles in real life.
