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.
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A linear function is a function whose graph is a straight line.
It will be f(x+4).
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.
The absolute value of a function changes the original function by ensuring that any negative y values will in essence be positive. For instance, the function y = absolute value (x) will yield the value +1 when x equals -1. Graphically, this function will look like a "V".