Question

1) 2x + 3x; 2) 7x – 4x; 3) 5y + 9y; 4) 6y – y; 5) x + 4x + 5x; 6) 8x + 3x – x; 7) 10x + 7x – 8x; 8) 9y + 2y – 4y.

Answer 1

1)5х
2)3х
3)4у
4)5у
5)10х
6)12х
7)-5х
8)3у

Answer 2

It seems like you've provided a list of algebraic expressions involving variables. If you'd like, I can help you simplify or combine these expressions. Let's go through each one:

1. 2x + 3x = 5x
2. 7x – 4x = 3x
3. 5y + 9y = 14y
4. 6y – y = 5y
5. x + 4x + 5x = 10x
6. 8x + 3x – x = 10x
7. 10x + 7x – 8x = 9x
8. 9y + 2y – 4y = 7y

If you have any further questions or need additional explanations, feel free to ask!