the independent variable is usually assigned to x
the dependent variable is usually assigned to y
their values will vary because they are variables. that is the definition of variable
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The dependent variable depends on the independent variable for its values as for example in the straight line equation y = 2x+6 whereas y is the dependent variable and x is the independent variable
You choose the values of the independent variable. The dependent variable is the one you measure.
Independent variables can take values within a given boundary. The dependent variable will take values based on the independent variable and a given relationship at which the former can take its values.
An independent variable can be any of a given set of values while a dependent variable is represented as a function of another variable.
Independent and dependent variables are graphed on the axes of a rectangular grid (e.g. graph paper). The important thing is to understand which is which. The independent variable is graphed on the horizontal (x-) axis. In an experiment you choose values of the independent variable and measure the values of the dependent variable (it "depends' on the other). The dependent variable is graphed on the vertical (y-) axis.