Functions
______________________________	Increasing, decreasing and constant functions
A function f is increasing in an interval if x1 < x2 implies f(x1) < f(x2) for every x1,x2 in the interval. The graph of an increasing function "goes up" when x increases. A function f is decreasing in an interval if x1 < x2 implies f(x1) > f(x2) for every x1, x2 in the interval. The graph of a decreasing function "goes down" when x increases. A function f is constant in an interval if f(x1) = f(x2) for every x1, x2 in the interval. The graph of a constant function is horizontal.

You can see below the graphs of an increasing, a decreasing and a constant function.

Esta unidad interactiva requiere la máquina virtual de Java J2RE.

Esta unidad interactiva requiere la máquina virtual de Java J2RE.

Esta unidad interactiva requiere la máquina virtual de Java J2RE.

Activity 5:
The following graphs corresponds to a function which is increasing, decreasing and constant in different intervals. Copy it in your notebook and specify the intervals where the function is increasing, decreasing and constant.

Esta unidad interactiva requiere la máquina virtual de Java J2RE.

Manuel Barreiro Abeijón

Ministerio de Educación, Cultura y Deporte. Año 2010

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