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2x + 3y = 18 2x - 3y = 20
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Dichotomous means "having only two possible values." Examples of dichotomous variables are yes/no or male/female.
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.