Over the summer, you text a bunch.  Let’s say you make 50 texts every 2 days.

Drag and drop  

Fill in the missing parts of the table:

 

 
x - # of days 0 3 7 12
y - # of texts Response area 75 175 Response area
This is a Response area relationship because it is Linear with the y-intercept at 

1 answer

x - # of days 0 3 7 12
y - # of texts 50 125 250 325