If the function is a one-to-one function, therefore it has an inverse.
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A linear function. It is a horizontal line at -7.
horizontal line
"y = f(x) is a function if it passes the vertical line test. It is a 1-1 function if it passes both the vertical line test and the horizontal line test. " - In order to be a one-to-one function, it first has to BE a function and pass the vertical line test. For example, a relation on a graph like a circle that does not pass the vertical line test is not function nor one-to-one.
The horizontal change is the change in x. If the line in horizontal then the horizontal change will just be its length.
For a horizontal line, it is y= a value