Answer:
Graph C represents a decreasing function.
Step-by-step explanation:
Graph A: Since y does not change when x increases from 0 to 6, this graph (a horizontal line) represents a constant function. REJECT this choice.
Graph B: The line connecting (0, 0) to (6, 6) is a straight line with slope +1; it's an increasing function. REJECT this choice.
Graph C: As we go from (0, 5) to (6, 0), y decreases by 5. Thus, this is the correct answer choice.
Graph D is a vertical straight line; its slope is undefined. REJECT this choice.
