You use variables to stand for numbers in algebra
In algebra, x is the unknown for which you need the value.
In algebra we consider x,y and z are variables.
x2
Variables stand in the place of unknown numbers. For example, in the following equation, one number is unknown: 2+x=5. The x takes the place of the number that is unknown.
Algebra is using variables such as x to solve a problem. One example is x+3=8 in which x equals 5.
Discrete Algebra and Geometry.
x+7
x is the unknown number in algebra
Oh honey, algebra is just a fancy way of saying we're gonna add some letters together. So, if you wanna know what x plus y is, well, it's just x plus y. No magic tricks here, just basic math. Hope that clears things up for ya!
Sometimes... some variables can only stand for one thing, like m= slope, but "x" is a variable that can stand for just about anything; slope, axis, and equations.
3x^2