Joe purchased a tray of 48 petunias to plant in his garden. The graph shows points representing the number of flowers left to plant at several different times while Joe is planting.
___x + y = ___
![Joe purchased a tray of 48 petunias to plant in his garden The graph shows points representing the number of flowers left to plant at several different times wh class=](https://us-static.z-dn.net/files/de4/0d2e03b9c5ba24d915d1d97d2e826926.png)