CPM Homework Help : CC3MN Problem 10-137

Multiple Choice: Which equation below could represent a tile pattern that grows by adding three tiles and has nine tiles in Figure $2$ ?

Hint 1:

Growth is the rate of change or the slope, in slope intercept form ( $y = mx + b$ ) what variable represents the growth?

Hint 2:

Knowing figure $2$ has nine tiles, how can you use the growth to find the number of tiles in figure number $0$ (starting figure)?

More Help:

Write the equation in slope intercept form, then rearrange to Standard form ( $Ax + By = C$ ).

Answer:

(c)