The graph shows the amount of water remaining in a bucket that was initially full before a hole was made in its side. What is the slope of the shown function that passes (0, 30)?

Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: The graph shows the amount of water remaining in a bucket that was initially full before a hole was made in its side. What is the slope of the shown function that passes (0, 30)?

Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: The graph shows the amount of water remaining in a bucket that was initially full before a hole was made in its side. What is the slope of the shown function that passes (0, 30)?
