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The graph is a region of the space on one side or another of the related function. If the inequality is strict then the related function itself is not part of the solution; otherwise it is.
It is considered an inequality.
Without an inequality sign it can't be considered to be an equation but it can be simplified to: 4-2a
No. There is no equality (or inequality) in the question: only a list of expressions.
With a formula, you know the variable's value, and you have to calculate the value of the function of it. With an equation, you know the function's value, and you have to calculate the value of the variable.