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6-141.

Multiple Choice: Which equation below could represent a tile pattern that grows by adding three tiles and has nine tiles in Figure ?  

Growth is the rate of change or the slope, in slope intercept form () what variable represents the growth?

Knowing figure has nine tiles, how can you use the growth to find the number of tiles in figure number (starting figure)?

Write the equation in slope intercept form, then rearrange to Standard form ().

(c)