0
In an equation "x" is the value assigned to one of the unknown quantities in the equation. (example: y= mx+b).
X is often used to describe any unknown thing, as in x-ray which were named this because the nature of the ray was initially unknown.
Wiki User
∙ 13y ago
Wiki User
∙ 7y agoIf you're talking about Roman Numerals, 10. If you're talking about something else, it's unknown; that's why they used a variable to represent it. (It may be possible to find the value of the variable, but you'd have to give a lot more details.)
Wiki User
∙ 7y ago"X" as well as other letters are used in algebra as a variable, meaning either that they can have any value, or that their value is initially unknown.
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