How do i do this?? explain it please!!?

Question

Graph in your notebook and give the radius and center for the following equation.

x^2 plus y^2 = 4

please only experienced people answer

Answer 1

You want to graph y = f(x) { or vice versa}

{{if you wanted to be a smart **s you could graph x²+y² wrt whatever.}}

solve for y or x (doesn't matter which) - say y

Estimate the number of points you want to graph - say 20

It should be obvious by just examining the equation that (excluding complex numbers) neither x nor y can be greater than 2.  Right? !

So pick 5 values between [0 to 2] to graph for the x value

Solve for the y value

Since these are squares +x and -x have two y values each, ±y.

So each value of x gives you four points

Graph them.

If you then can't figure what the radius or center is, then get a brain transplant.

Answer 2

center is 0,0 and radius is 2 (i.e. square root of 4)

Answer 3

x^2 plus y^2 = 4

ok this is easy

compare to the circle format (x-a)^2 + (y-b)^2 = r^2

so we know a=0 and b=0 and r^2 =4

so radius =2

cernter 0,0