Answer:
The first graph has this property.
Explanation:
The first graph, consisting of a straight line with decreasing slope, is the correct answer choice. We can verify that the slope of this line is -1/4 by reading "rise" and "run" from the graph and writing the ratio rise / run.
The second graph is a quadratic whose slope varies as we move along the graph.
The third and fourth cases do show constant rates of change, but neither is -1/4.