Question: For data with evenly spaced inputs, if the first differences are ---Select--- constant variable decreasing increasing , then a linear model is appropriate for the

For data with evenly spaced inputs, if the first differences are ---Select--- constant variable decreasing increasing , then a linear model is appropriate for the data. In the data shown in the table,xrepresents the input andyrepresents the output. What are the first differences?

x y First difference
0 75
1 69
2 63
3 57
4 51
5 45

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