tolong donk kerjakn ini kak

1)a) 8x-5y+ (-3x+7y)
5x+2y
b) 15a+7b-5c + (-11a-12b+13d)
4a-5b-5c+13d

3) -2x+5y - (8x-7y)
-2x+5y-8x+7y
-10x+12y

1. a. (8x-5y) + (-3x + 7y)
= 8x-5y-3x+7y
= 8x-3x-5y+7y
= 5x + 7y

b. (15a+7b-5c) + (11a-12b+13d)
= 15a+7b-5c-11a-12b+13d
= 15a-11a+7b-12b-5c+13d
= 4a-5b-5c+13d


2. (7n-8m+10)-(3m+4n-6)
= 7n-8m+10-3m+4n-6
= 7n+4n-8m-3m+10-6
= 11n-11m+4


3. (8x-7y)-(-2x+5y)
= 8x-7y+2x+5y
= 8x+2x-7y+5y
= 10x-2y