Choose the graph that best describes the following:
Amount of fuel in a car (Y) while driving as a function of time (X).
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Choose the graph that best describes the following:
Amount of fuel in a car (Y) while driving as a function of time (X).
Given that the vehicle uses fuel for engine operation, the fuel decreases over time.
The more the vehicle travels, the more the amount of fuel decreases.
The graph that correctly describes this is B.
Is the function in the graph decreasing?
Think about the real situation! As a car drives (time increases), it burns fuel, so the fuel amount decreases. This means the line goes from upper left to lower right.
For basic problems, we assume constant fuel consumption rate. In reality, fuel usage can vary, but a straight line is a good approximation for steady driving conditions.
This question asks about fuel usage while driving, so we don't consider refueling stops. The graph shows continuous driving with steady fuel consumption.
Use this memory trick: "As time goes up, fuel goes down". Look for the graph where the line slopes downward from left to right.
The slope represents fuel consumption rate - how quickly the car uses fuel. A steeper downward slope means faster fuel consumption.
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