Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_9 (totaltk INTEGER, yards INTEGER)
### Question:
what is the sum of totaltk when yards is less than 0?
### Answer:
SELECT SUM(totaltk) FROM table_name_9 WHERE yards < 0