Which of the following expressions is equivalent to 9-8y-10+y?

-7y+1
-7+19
7y-1
-7y-1

To simplify the expression 9 - 8y - 10 + y, we combine like terms. The terms with y can be combined, as well as the constant terms.

9 - 10 - 8y + y

Combine the constant terms:

-1 - 8y + y

Combine the terms with y:

-7y + 1

Therefore, the expression is equivalent to -7y + 1.