How to evaluate an Algebric Expression?
To evaluate an algebraic expression all we need to do is just to replace the given values
for the unknowns and calculate according to the rules for the order of operations.
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Example: To find the value of y + 3y - 1 when x = -1, replace -1 for y:
(-1)(-1) + 3(-1) - 1 = 1 -3 -1 = -3.
