I used this slideshow as a beginning lesson for solving multi-step inequalities in Algebra I.  Students learned two-step inequalities in previous grades so I was relying on their prior knowledge and began with application situations.  I revised a lesson from Robert Kaplinsky and used his video to provide the details needed for the students.  

https://docs.google.com/presentation/d/1aUk8z-qKk6Bv9EsDp88tQZv8E6ZkHOLotbkVHsZx8Fw/edit?usp=sharing

Launch:

Have students make estimates about the number how many of each item would equal 2000 calories.  Then verify their estimates with the video.   Review estimates to see who was closest and discuss results.

Lesson:

Work through the slides having students represent different inequalities based on the information.  While working emphasize the vocabulary - at most, under, no more than, etc.   I would suggest students work with partners or small groups.  You could have groups present their inequalities or do a gallery walk to see different inequalities.  

Extend:

Have students create their own problem.  I included a sentence starter to scaffold for students.   Then work through some of the student created problems.

Closure:

After you have practiced solving a variety of inequalities, use the which one doesn't belong.  Have students discuss in small groups which one doesn't belong and why.  Challenge them to come up with multiple answers.  Discuss their answers and similarities and differences.