Solve the following system graphically. click on the graph until the correct solution of the system appears.

(pic 1 is part of the question, the rest are the answers)

50,000 years ago

The idea of number and the process of counting goes back far beyond history began to be recorded. There is some archeological evidence that suggests that humans were counting as far back as 50,000 years ago. However, we do not really know how this process started or developed over time.

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