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Height and Weight.
The easiest way is to draw a scatter plot.We are assuming here that the variables are supposed to have a relation, for ex height and weight of people.
In such cases, typicall different variables appear raised to different powers. You choose the smallest of such powers. If a variable only appears in one of the two expressions, you don't include it at all.
The two types of variables are the CONSTANT and CONTROL.
An equation with two variables . . . seriously!An equation with one variable can be can be solved, but when there are two variables, you need two equations. This is called a system of two equations in two variables.Three equations in three variables, etc.