What are 2 ways you can determine if -2x=10

Given that there are four guests in each table, the 12 tables would have 48 guests. the restaurant desires to have at least 1 server per 48 people. the inequality that would best represent the given situation is,
                                  48x  ≥ y
if we try to substitute 1 to x and 1 for y we get, 48  ≥ 1 which is true.