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4-38.

Look at the graph at right. What statements can you make about the tile pattern the graph represents? How many tiles are in Figure ? Figure ? What is the pattern of growth? What is the rule for the pattern?  

See graph.

Added to the graph, a vertical ray, from the origin, to the point (0, comma 7).

Use the same method used to find the number of tiles in
Figure .

Find an equation in the form of .

How is the number of tiles changing?

growth factor

First quadrant coordinate plane, x axis labeled, Figure Number, scaled in ones from 0 to 7, y axis labeled, Number of Tiles, scaled in twos, from 0 to 16. An increasing line starts at the point (0, comma 7), and  goes through the points,  (1, comma 9), (2, comma 11), (3, comma 13), and (4, comma 15). A right triangle has vertices at the points (1, comma 9), (3, comma 9), and (3, comma 11).