One can find the function of a firewall on various websites like Wikipedia and Dummies. One could also check his firewall in control panel and read what the function of a firewall is.
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You need to know the domain in order to find the range.
y = x - 3 is a linear function where for each x-value we find one and only one y-value.
One to one functions on a graph can vary. To determine if a function is one to one, a horizontal line can only intersect the function once. If it intersects the function more than once, it is not a one to one function.
If the line is a straight line, meaning 180degrees, it can only have one slope. If it is a function (f(x)= or y=) then the line may have more than one, one, or an undefined slope. Find the first differential of the function and plug in your given x value to find the slope at any given point.
The number of function is Geometry