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what is dependent variable

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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, or function that has its value determined by the choice of value(s) of other variable(s).
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 The variable on which the effect of independent variable is observed
 
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A dependent variable is a variable whose value depends upon independent variable s. The dependent variable is what is being measured in an experiment or evaluated in a mathematical equation. The dependent variable is sometimes called "the outcome variable."

In a simple mathematical equation, for example:

a = b/c

the dependent variable, a , is determined by the values of b and c .

Here's a simple example:

A city planner needs to compare the number of drivers who go through red lights between 8 a.m. and 9 a.m. with the number of drivers who do so between 9 a.m. and 10 a.m. In this scenario, the time span is the independent variable and the difference in the number of drivers going through red lights during those time spans is the dependent variable.

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