To "evaluate" an expression, you need to know the value for the variables.
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"Evaluate" means to calculate - find out what value it has.
explain how to evaluate an algebraic expression for given variables. how would we evaluate the expression "3x-4y+9" when x=2and y=5?
A variable
-2-3=+7
Without further information, it is not possible to evaluate or simplify the expression.