Write as a Function of y x^2+y=81

$x^{2} + y = 81$

Step 1

Subtract $y$ from both sides of the equation.

$x^{2} = 81 - y$

Step 2

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x = \pm \sqrt{81 - y}$

Step 3

The complete solution is the result of both the positive and negative portions of the solution.

First, use the positive value of the $\pm$ to find the first solution.

$x = \sqrt{81 - y}$

Next, use the negative value of the $\pm$ to find the second solution.

$x = - \sqrt{81 - y}$

The complete solution is the result of both the positive and negative portions of the solution.

$x = \sqrt{81 - y}$

$x = - \sqrt{81 - y}$

$x = \sqrt{81 - y}$

$x = - \sqrt{81 - y}$

Step 4

To rewrite as a function of $y$ , write the equation so that $x$ is by itself on one side of the equal sign and an expression involving only $y$ is on the other side.

$f (y) = \sqrt{81 - y}, - \sqrt{81 - y}$

Write as a Function of y x^2+y=81

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