No.
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A system of equations is a set of equations with more than one variable dealing with the same material. If there are 2 variables, then the system must have 2 equations before it can be solved. 3 variables need 3 equations, etc.
It really depends on the equation; except for the most trivial equations, you will usually need more than one step.
well, an equation with one variable is a one step equation and an equation with more than 2 variables is a multi-step equation
Yes, an expression can have more than one variable.
A system of equations can have any number of inequalities.