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Conventionally, the independent variable would be x. y, the dependent variable, is defined by the equation in terms of x.
y=a+bx so the slope is b
As it is written, x is the independent variable and y is the dependent. But you could re-write it as x = y/23 + 30/23 and then y is the independent variable and x the dependent.
Say y = x2 y is the dependent variable, x is the independent variable.
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 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