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Elam is packing his room to move into a new house. A small box can hold 8 books without breaking, while a large box can hold 12 books without breaking. He has at most 160 books to pack and less than 30 boxes total. Let [tex]$s$[/tex] represent the number of small boxes and [tex]$l$[/tex] represent the number of large boxes. The inequalities [tex]$s \geq 0$[/tex] and [tex]$l \geq 0$[/tex] are part of the system that models this scenario.

Which inequalities complete the system?

A. [tex]$s - l \ \textless \ 30$[/tex]

B. [tex]$8s - 12l \leq 160$[/tex]

C. [tex]$s + l \ \textless \ 30$[/tex]

D. [tex]$8s + 12l \leq 160$[/tex]

E. [tex]$s + l \ \textgreater \ 30$[/tex]

F. [tex]$8s + 12l \leq 160$[/tex]

G. [tex]$s + l \ \textless \ 30$[/tex]

H. [tex]$8s + 12l \geq 160$[/tex]

Answer :

To solve the problem of packing books for Elam, we need to identify which inequalities complete the system based on the given conditions:

1. Understand the Box Capacity:
- A small box can hold 8 books.
- A large box can hold 12 books.

2. Total Books Constraint:
- Elam has at most 160 books. So, the total number of books packed in the small and large boxes must be at most 160.
- This gives us the inequality: [tex]\(8s + 12l \leq 160\)[/tex].

3. Total Box Constraint:
- Elam can use less than 30 boxes in total. This means that the total of small and large boxes used must be less than 30.
- This condition is represented by the inequality: [tex]\(s + l < 30\)[/tex].

4. Non-Negativity Constraints:
- Since Elam cannot use a negative number of boxes, both small and large box counts must be non-negative.
- These constraints are given as: [tex]\(s \geq 0\)[/tex] and [tex]\(l \geq 0\)[/tex].

Putting it all together, the system of inequalities that models this situation is:

- [tex]\(8s + 12l \leq 160\)[/tex]: This ensures that the total number of books does not exceed 160.
- [tex]\(s + l < 30\)[/tex]: This ensures that the total number of boxes used is less than 30.
- [tex]\(s \geq 0\)[/tex] and [tex]\(l \geq 0\)[/tex]: These ensure that the numbers of small and large boxes are non-negative.

These inequalities comprehensively describe the constraints Elam faces when packing his books into boxes.

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