Consider the linear function with equation y = 3x + 5.

Sketch the graph of the linear function on the grid.

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Here is a picture of the graph, and this is how I did it.

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Then it says.. Restrict the domain to the set of natural numbers. Mark the dots points on the graph which represent the function on the restricted domain.

Write the first 5 elements of the range in numerical order.

Show that the elements of the range form an arithmetic sequence and state the common difference.

I don't understand this at all.