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Q: Equation that contains more than one variable?

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Multivariable equation

An equation with more than one variable is called a multivariate 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.

It helps to visualize the problem and to think better about the way(s) you're going to solve it. After you draw a picture, you place there the known information, and denote by a letter the unknown(s). Since you've organized everything on the picture, it's easier to relate things with each other by using the knowledge of geometry. For example, if the equation contains more than one variable, you can express the variable for which you want to solve the equation in terms of other variable(s) (the geometric formulas are very handy).

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Multivariable equation

Multivariable equation

add one to the problem

An equation with more than one variable is called a multivariate equation.

Simultaneous equation* * * * *No, simultaneous equations are two or more equations that have all to be true at the same time (simultaneously) for the solution.An equation with more than one variable is a multivariate equaion.Area = 0.5*Length*Height or a = 0.5*l*h for the area of a triangle has more than one variables, but it is certainly not simultaneous.An equation with a variable is called a single variable equation. An equation that has more than one variable is called as a multi-variable equation. A polynomial equation has one variable in different powers: a common example is quadratic equations.

A = b.

Sure. You can always 'solve for' a variable, and if it happens to be the only variable in the equation, than that's how you solve the equation.

well, an equation with one variable is a one step equation and an equation with more than 2 variables is a multi-step equation

a formula

True

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