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What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Does the point (1, sqrt 7) lie on circle shown.

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=