(3) A rate that is increasing means as the y variable increases, so does the x variable. This graph has its line rising up from left to right
(4) A graph with a rate that is decreasing would have the line sloping downwards from left to right (like the one provided in your question)
(5) A graph with a rate of zero means that, the y variable does not change, whereas the x variable keeps changing. This graph is a horizontal line (its parallel to the x-axis)
The rate is increasing
The rate is decreasing
The rate of change is zero
