There are many ways of categorising variables. One classification, used in statistics, is Nominal, Ordinal and Interval.
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It depends on the number of variables and their nature: 2 variables, both independent: either axis 2 variables, one independent: x-axis 3 variables, all independent: any axis 3 variables, 2 independent: x or y-axis. 3 variables, 1 independent: x-axis. and so on.
1) I learned that you can have as many variables as you want. 2) You can change the variables. 3) Variables is used in an experiment. 4) A variable is something that can be changed, such as a characteristic or value. Variables are generally used in Psychology experiments to determine if changes to one thing result in changes to another.
It is not possible to solve one linear equation in two variables for either of the variables.
No. At least, it can't have EXACTLY 3 solutions, if that's what you mean. A system of two linear equations in two variables can have:No solutionOne solutionAn infinite number of solutions
Since no terms are added, it is a monomial (one term). Adding the powers of the variables (three variables, each to the first power), you see that it is of degree 3.