Question

At work, Brett must check and record the internal temperature of the freezer on an hourly basis. When working
properly, the temperature should remain constant over time. What word describes the slope of a line showing the
temperature of the freezer as a function of time in hours when the freezer is working properly?
positive
zero
negative
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Answer 1

Answer:  zero

Explanation:

A slope of zero means there isn't any change in the y value. The graph isn't going upward, and it's not going downward either. We have a flat horizontal line. All horizontal lines have a slope of zero.

You can think of it like this

slope = rise/run = 0/1 = 0

rise = 0 means the y value isn't changing.