Let x be the number of minutes they read and y the number of pages they read.
Since Alejandro read one page per minute and he has so far read a total of 28 pages he the total amount of pages he read is:
![y=x+28](https://img.qammunity.org/2023/formulas/mathematics/college/1c04je1galrjk99mcvd6qmez3vcged6z21.png)
Now, Carly reads twice as much in the same time but she has read only 12 pages so far, then the amount of pages in her case is:
![y=2x+12](https://img.qammunity.org/2023/formulas/mathematics/college/n48uwakjoyktcfus5suhe1qe8h9i8bilbn.png)
The graphf of this equations are:
The rate of change:
Alejandro: 1
Carly: 2