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2) = 2x² + 1x + 12
1. (x² - 5x - y + 6) - (x² - 3x - y + 2)
= x² - x² - 5x + 3x - y + y + 6 - 2
= - 2x + 4
2. (x² - 5x - y + 4) - (x² - 6x - y - 8)
= x² - x² - 5x + 6x - y + y + 4 + 8
= x + 12