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Independent variables are the input value of a function (usually x) and dependent variables are the output value of the function (usually y).
They are usally written as x,y,z,a,b,c,l,m,k or really any letter from the alphabet
An expression written with 1 or more variables is called an equasion
yes. 2 variables can be written in one statement. take for example the equation y=3x+5, as long as you have a single solution to work with there can be 2 variables.
There is no such thing as definite variable in mathematics. Some of the variables in mathematics are independent and dependent variables. More variables are usually found in probability textbooks.