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Simplifying 4x2 + 4y2 = 81 Solving 4x2 + 4y2 = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4y2' to each side of the equation. 4x2 + 4y2 + -4y2 = 81 + -4y2 Combine like terms: 4y2 + -4y2 = 0 4x2 + 0 = 81 + -4y2 4x2 = 81 + -4y2 Divide each side by '4'. x2 = 20.25 + -1y2 Simplifying x2 = 20.25 + -1y2 Reorder the terms: -20.25 + x2 + y2 = 20.25 + -1y2 + -20.25 + y2 Reorder the terms: -20.25 + x2 + y2 = 20.25 + -20.25 + -1y2 + y2 Combine like terms: 20.25 + -20.25 = 0.00 -20.25 + x2 + y2 = 0.00 + -1y2 + y2 -20.25 + x2 + y2 = -1y2 + y2 Combine like terms: -1y2 + y2 = 0 -20.25 + x2 + y2 = 0 The solution to this equation could not be determined.
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