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In a mathematical equation, the expressions on either or both sides of the equality sign (=) may involve one or more symbols standing for unknown quantities: the "variables." A standard method of solving an equation is by transforming it into another that has the same set of solutions. When all occurrences of a variable appear on just one side of the equality, that variable has been "isolated." Some people might apply a stricter criterion in which one side of the equation must consist only of that variable.
For example, in the equation
x + 3 = 2x + 1
there is one variable "x" but it is not isolated. It can be isolated by subtracting x+1 from both sides to produce the equivalent equation
(x + 3) - (x + 1) = (2x + 1) - (x + 1)
Rules of arithmetic permit the left hand side to be rewritten as "2" and the right hand side to be rewritten as "x", giving
2 = x.
Now x is an isolated variable.
See the Wikipedia article on "Elementary algebra" for details.
The term "isolated variable" is also used in statistics in many slightly different ways. It appears to be used by investigators to refer to an experiment in which exactly one of many factors under experimental control is varied to determine its effect on the experimental outcome. This factor is called the "isolated variable."
Another related meaning is in a multiple regression context where, as part of the analysis, all but one of the explanatory variables is left out: the remaining one is the "isolated variable." See Walter et al., "Creatinine clearance versus serum creatinine as a risk factor in cardiac surgery," BMC Surgery 2003, 3:4 at http://www.biomedcentral.com/1471-2482/3/4 for an example.
Yet another related meaning is that a statistical variable 'X' is "isolated" when there is no direct causal relationship between 'X' and any of the other variables in the statistical model. For an example of this usage, see the "final review questions" page for the "Quantitative Research in Public Administration" course at NC State University at http://www2.chass.ncsu.edu/garson/PA765/ch15qanda.htm.
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When an equation contains addition can the variable be isolated by performing the opposite process namely subtraction?
Yes.
What is an independent variable dependent variable and controlled variable?
an independent variable is a thing you can change on your own. a depentent variable is a variable you depend on and a responding variable is a variable that reacts to the experiment
The input variable is called the what variable?
The independent variable. The output variable is dependent on this variable's value and so is called the dependent variable.
What is the manipulating variable the dependent variable or the independent variable?
The independent variable.
What does dependent variable and independent variable mean in math?
An independent variable is a variable that isn't affected by something else. A dependent variable is a variable that's affected by changes in the independent variable.
What is the definition of isolate the variable?
In algebra, its to move the pieces of the equation around so that the variable is isolated to only one side of the sign
When an equation contains addition can the variable be isolated by performing the opposite process namely subtraction?
Yes.
How many variable should be tested and isolated in a good experiment?
One. If there is only one variable being tested, when you compare it to the control, you know that was the cause of a change.
What is dependent quantity means in math?
A variable that depends on one or more other variables. For equations such as y = 3x - 2, the dependent variable is y. The value of y depends on the value chosen for x. Usually the dependent variable is isolated on one side of an equation. Formally, a dependent variable is a variable in an expression, equation, orfunction that has its value determined by the choice of value(s) of other variable(s).
7 ex equals 27.09?
the question is: 7x = 27.09so what you do is divide 27.09 by 7 to get x the variable alone, or isolated. making the answerx= 3.87
True or false. the control subject of an experiment be exposed to all variables?
False. The control subject (Or control group) should be kept isolated from the variables of the experiment. This group will detemine if changing a variable is better or worse than not changing the variable.
When is an experimental variable good?
A experimental variable is good when you are trying to test an experiment. A variable may be easily controlled, isolated, and measured. For instance a difficult experimental variable may be a persons gender. You can control if a man or woman participates in your experiment, you may even easily identify which gender they are. But it may be difficult to determine if the results are due to inherent genetic differences, or social influence on their lives. that isn't to say it can't be used, it just is more complicated than a "good" variable. A good variable could be something like Height, eye color, etc. that don't have that confounding aspect. In summary - The primary variable should be controllable, where you can directly manipulate it. The more controllable, the better. The variable you measure, and the one you control, should be isolated. You should be able to distinguish it from other complicating factors. The variable should be measurable. Some things are easy, such as height. Others not so easy, such as pain, or opinion. Developing tools to measure such variables are key.
Why is substitution the best method in solving systems of equations?
It is not always the best method, sometimes elimination is the way you should solve systems. It is best to use substitution when you havea variable isolated on one side
Where is C9H17NO3 isolated?
C9H17NO3 is isolated in the liver.
What is an adjective for the word isolated?
Isolated is an adjective.
Work this problem Given P equals 2l plus 2w close parenthesis solve for B Put answer in form of isolated variable formula?
There is no indication as to what B represents and consequently no possibility of answering the question.
What is an independent in a science experiment?
If you mean an "independent variable", it is something that has been carefully isolated in an experiment as being the only factor known to have changed, so that its effects can be analyzed without other factors affecting the result.
