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U can see if there is and input that can go into two outputs if there is it's not a function if there is and imput that only goes in to one output it's is a function
A linear function has and x and a y and neither one is raised to a power other than 1.
One way is to try the vertical line test on a graph!
You need to know the domain in order to find the range.
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.