How do you work out a math problem with a equals sign with a slash through mean?

Answer 1

An equals sign with a slash through it means "Does not equal"

This would be used to exclude a potential result:

Example: What two positive integer numbers add to 3 (x =/= 2)

As the integer pairs adding to 3 are x=1, y=2 and x=2, y=1, you would exclude x=2 as the question prohibits that answer leaving x=1, y=2 as the correct answer