The code for 'M' in that language is 7.
1. Identify common elements:
* The word HOME is coded as 7519.
* The word MUST is coded as 6782.
2. Find the shared letter:
* Both words share the letter 'M'.
3. Find the shared number:
* Looking at both codes (7519 and 6782), the only digit they have in common is 7.
4. Determine the code for 'M':
* This means the letter 'M' corresponds to the number 7.