Understanding function notation

The graph of the function f(x) = -1 + 0.5x is shown on the coordinate plane.  
For what value of x does f(x) = 0?

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Where f(x) = 0 is the x-intercept. That is where the graph crosses the x-axis.  Remember, f(x) is the
y-value, so if y is equal to 0, this is the x-intercept.  The graph of f is the graph of the equation y = f(x).

The value of x, when f(x) = 0 is 2.

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