Hello there!
Here are 3 mathematical terms used for x values:
- The domain - since x values are a domain and y values are a range.
- The variable - since a variable is a thing that changes, and, well, x values change based on what you input.
- The independent factor - since the dependent factor depends on whatever the independent factor is, the x value can be anything and the result will change depending on whatever x value you have inputted, making it dependent.
I hope this was helpful and have a great rest of your day!