Suppose that during its flight, the elevation e (in feet) of a certain airplane and its time t, in minutes since takeoff, are related by a linear equation. Consider the graph of this equation, with time represented on the horizontal axis and elevation on the vertical axis. For the following situation, decide if the slope is positive, zero, or negative: The plane is cruising at an altitude of 37,000 feet above sea level.

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Select one:
Positive
Zero
Negative