It is said in the book that y = f (x), X is an independent variable and Y is a dependent variable. If the function is written as y = 5x + 2, then the independent variable is x and the dependent variable is y. if it is written as x = 1 ^ 5y-2 ^ 5, then y is the independent variable and X is the dependent variable?

You are right. Generally, the right is the independent variable and the left is the dependent variable. No matter how the letters on both sides are written, X and y will be changed. For example, when y = 5x + 2 is written as x = (Y-2) / 5, y is the independent variable and x is the dependent variable. But for the sake of habit, it will be changed to y = (X-2) / 5. This is the inverse function of y = 5x + 2

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