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Verified answer
A.5× - 9 dengan 7×+15y= 5x - 7x - 9 - 15y
= - 2x - 24y
b) (5y - 3x - 4) - (5x - 3y + 7)
= - 3x - 5x + 5y + 3y - 4 - 7
= - 8x + 8y - 11
c) (5x² - 9xy - 4y²) - (-x² - 6xy + 3y²)
= 5x² + x² - 9xy + 6xy - 4y² - 3y²
= 6x² - 3xy - 7y²