Subtract 3x² – 5y – 2 from 5y – 3x² + xy and find the value of the result if x = 2, y = -1.

(5y – 3x² + xy) – (3x² – 5y – 2)

= 5y – 3x² + xy – 3x² + 5y + 2

= -3x² – 3x² + 5y + 5y + xy + 2

= -6x² + 10y + xy + 2

Putting x = 2 and y = -1, we get

-6(2)² + 10(-1) + (2)(-1) + 2

= -6 × 4 – 10 – 2 + 2

= -24 – 10 – 2 + 2

= -34