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Simplifying 7x2 + 21y2 = 7 Solving 7x2 + 21y2 = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21y2' to each side of the equation. 7x2 + 21y2 + -21y2 = 7 + -21y2 Combine like terms: 21y2 + -21y2 = 0 7x2 + 0 = 7 + -21y2 7x2 = 7 + -21y2 Divide each side by '7'. x2 = 1 + -3y2 Simplifying x2 = 1 + -3y2 Reorder the terms: -1 + x2 + 3y2 = 1 + -3y2 + -1 + 3y2 Reorder the terms: -1 + x2 + 3y2 = 1 + -1 + -3y2 + 3y2 Combine like terms: 1 + -1 = 0 -1 + x2 + 3y2 = 0 + -3y2 + 3y2 -1 + x2 + 3y2 = -3y2 + 3y2 Combine like terms: -3y2 + 3y2 = 0 -1 + x2 + 3y2 = 0 The solution to this equation could not be determined.
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