Chapter 4 - An Introduction to Functions - 4-2 Patterns and Linear Functions - Apply What You've Learned - Page 245: d

$ S = 8m+48 $ This is the equation for the relationship between the number of months and the number of subscribers. This relationship can be represented as $ S = 8m+48 $ as this is the pattern that the data follows. When the number of months is 0, this is shown as $ S = 8(0)+48 $ which is equal to 48. When the number of months is 1, this is shown as $ S = 8(1)+48 $ which is equal to 56. When the number of months is 2, this is shown as $ S = 8(2)+48 $ which is equal to 64. This pattern continues for the rest of the data.

Explanation above.