Let's see how to install the Maven plugin for Eclipse:

1. Open Eclipse and navigate to Help | Install New Software.
2. Click on the Work with drop-down menu.
3. Select the <eclipse version> update site.
4. Click on Collaboration tools.
5. Check Maven Integration for Eclipse, as in the following screenshot:

6. Click on Next and then click on Finish.
7. There will be a prompt to restart Eclipse, and Maven will be installed after the restart.

Now let's see how we can install the Scala plugin for Eclipse:

1. Open Eclipse and navigate to Help | Install New Software.
2. Click on the Work with drop-down menu.
3. Type http://download.scala-ide.org/sdk/helium/e38/scala210/stable/site.
4. Press Enter.
5. Select Scala IDE for Eclipse:

6. Click on Next and then click on Finish. You will be prompted to restart Eclipse, and Scala will be installed after the restart.
7. Navigate to Window | Open Perspective | Scala.

Eclipse is now ready for Scala development.