Precalculus Examples

$7 x^{2} + 7 y^{2} + 3 = 31$

Step 1

Move all terms not containing a variable to the right side of the equation.

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Step 1.1

Subtract $3$ from both sides of the equation.

$7 x^{2} + 7 y^{2} = 31 - 3$

Step 1.2

Subtract $3$ from $31$ .

$7 x^{2} + 7 y^{2} = 28$

Step 2

Divide both sides of the equation by $7$ .

$x^{2} + y^{2} = 4$