400=x^2+y^2

Solution for 400=x^2+y^2 equation:

Simplifying
400 = x2 + y2

Solving
400 = x2 + y2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x2' to each side of the equation.
400 + -1x2 = x2 + -1x2 + y2

Combine like terms: x2 + -1x2 = 0
400 + -1x2 = 0 + y2
400 + -1x2 = y2

Add '-400' to each side of the equation.
400 + -400 + -1x2 = -400 + y2

Combine like terms: 400 + -400 = 0
0 + -1x2 = -400 + y2
-1x2 = -400 + y2

Divide each side by '-1'.
x2 = 400 + -1y2

Simplifying
x2 = 400 + -1y2

Reorder the terms:
-400 + x2 + y2 = 400 + -1y2 + -400 + y2

Reorder the terms:
-400 + x2 + y2 = 400 + -400 + -1y2 + y2

Combine like terms: 400 + -400 = 0
-400 + x2 + y2 = 0 + -1y2 + y2
-400 + x2 + y2 = -1y2 + y2

Combine like terms: -1y2 + y2 = 0
-400 + x2 + y2 = 0

The solution to this equation could not be determined.