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# Introduction to graphs

A simple way to represent a function is by drawing its graph. For each input $\Tblue{x}$ on the horizontal axis, called the $x$-axis, we plot the corresponding output $\Torange{y}=f(x)$ are on the vertical axis, called the $y$-axis.

The graph of a function gives its value for each possible input. Here, $f(\Tblue{2}) = \Torange{4}$

The graph is a two-dimensional representation of the input / output table associated with a function.

 x f(x) -2 -1 0 1 2 3 4 -7 -5 -3 -1 1 3 5
The function $\Torange{y} = 2 \Tblue{x} -3$ and its graph