The equation of a constant function is:

y = b

The criterion is given by a real number.

The slope is 0.

The graph is a horizontal line parallel to the x-axis.

Vertical Lines

The lines parallel to the y-axis are not functions. The equation of a vertical line is:

x = a


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I am passionate about travelling and currently live and work in Paris. I like to spend my time reading, gardening, running, learning languages and exploring new places.