hi answers this question with it solve I will mark brainlist

Answer:
9.c
10.a
11.c
12.a
13.b
14.b
15.b
1.a -4y+5x+8xy+6y-10xy-8x
we collect like terms so -4y+6y+5x-8x+8xy-10xy
2y-3x-2xy
b.-2x+3y+4xy-(-2x-3y+4xy)
-2x+3y+4xy+2x+3y-4xy
-2x+2x+3y+3y+4xy-4xy
3y+3y=6y