An equation with more than one variable is called a multivariate equation.
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A bivariate equation.
Multivariable equation
a formula
That depends on the equation. In general, you'll try to isolate the variable, by using operations (on both sides of the equation) that get rid of anything other than the variable, on the side the variable is on.
you first look at the varaibles and their power if there is more than one variable then you will have how ever many variables there are that's how many separate answers there will be also, if you have a number to the power or 2 then there will be two answers for that ONE variable... if you have a number to the power of 8 then you will have eight answers for the one variable.