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x-4y
2.) x²+ 10x² + 8y² - 7y²+11-16
11 x² + y² - 5
⇒ 9x - 8x = x
⇒ 6y - 10y = -4y
2. x² + 8y² - 16 + 10x² - 7y² + 11 = 11x² + y² - 5
⇒ x²+ 10x² = 11 x²
⇒ 8y² - 7y² = y²
⇒ -16 + 11 = -5