Not necessarily. It will be if it is the only independent variable in the system.
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An independent variable is one which does not rely on another variable for its value. For example, in the slope intercept form: y = 2x + 3 The x is the independent variable and the y is the dependent variable. The x can be set to anything, therefore it is independent. The value of y is dependent on x for its value.
It depends on what you are looking at. If you want to look at changes in variable Y when a variable X is changed, then X is the independent variable and Y is the dependent. But if you want to look at changes in X which accompany changes in Y, then Y is the independent variable and X is the dependent.
The value that you manipulate (change) goes on the x-axis. This is also known as the independent variable. :)
For example in the sraight line equation of y = 2x+6 it is y that is the dependent variable because its value is determined by the independent variable of x
The value of the Y-axis, which is normally expressed as a function Y=f(x), is called the dependent variable, because a change in the value of X (the independent variable) will produce a concurrent change in the value of Y.Independent variable.