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Graphing

I must construct a graph showing the relationship between two variables, X & Y

x: 0 1 2 3 4 5 6 7
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y: 50 39 29 20 12 5 0

In my graph I must do the following:

1.Determine whether the relationship is negative or positive
2.I must calculate the slope of the relationship between x & y when x equals 2 & when x equals 4.
3. I must explain the slope of the relationship as x increases.

I noticed that as x increases, y decreases, ie, when x is 0, y is 50 and when x is 1, y is 39, but I'm not sure what this decrease is indicative of.

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