if a system of linear equations has infinitely many solutions, what does this mean about the two lines?

 If a system has infinitely many solutions, then the lines overlap at every point. In other words, they're the same exact line so this means that any point on the line is a solution to the system.

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no, x cannot be the same number. in all of them, x is 1. for one input there is another output. g is not a function

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$12. that is my answer.