A team is selling discount cards as a fundraiser. The table shows the number of cards sold and the remaining amount of money needed. A table showing Discount Cards Fundraiser with two columns and six rows. The first column, Cards Sold, has the entries, 10, 20, 30, 40, 50. The second column, Remainder of Goal, has the entries, $875, $795, $715, $635, $555.

Which word describes the slope of the line representing the data in the table?

zero
undefined
negative
positive