I'm trying to write equations from some relations, but the problem is that, for y, there's fractions and I'm not quite sure how to deal with them. Any help would be greatly appreciated.

The problem is as follows:

Write an equation for each relation. Then complete each chart.

This is the chart, but since I don't know how to make a real chart, I suppose my makeshift one will have to do.

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3 is supposed to be under 0 and under 1 and so on.