Question

Solve x^2 + y^2 = 81 for x. Show solution steps.

Answer 1

x = ±√(81 -y^2)

Explanation:

Subtract y^2 and take the square root.

x^2 +y^2 -y^2 = 81 -y^2 . . . . . subtract y^2

x^2 = 81 -y^2 . . . . . simplify

x = ±√(81 -y^2) . . . . take the square root