Answer:
4x - xy + 46
Explanation:
sum the first 2 expressions
3x + 2xy - 22 - x + 7xy + 11 ← collect like terms
= (3x - x) + (2xy + 7xy) + (- 22 + 11)
= 2x + 9xy + (- 11)
= 2x + 9xy - 11
now subtract this sum from the third expression
6x + 8xy + 35 - (2x + 9xy - 11) ← distribute parenthesis by - 1 )
= 6x + 8xy + 35 - 2x - 9xy + 11 ← collect like terms
= (6x - 2x) + (8xy - 9xy) + (35 + 11)
= 4x + (- xy) + 46
= 4x - xy + 46