In the same way that you would solve equations because equivalent expressions are in effect equations
expressions don't have an equal sign and equations do
Equations are made from expressions.
They can but don't have to.
no algebraic expressions do not have equal signs but equations do.
These are two expressions, not equations. Expressions do not have solutions, only equations do. NB equations include the equals sign.
Equations are said to be equivalent if they have the same solution. This definition also holds true in rational equations or equations involving rational expressions. For instance, the equations 2x = 14 and x - 3 = 4 are equivalent. Why? It's because they have the same solution, that is x = 7.
They are called: Identical equations or IdentitiesSee: http://www.tutorvista.com/search/value-algebraic-expressions-33 - -7 = ss = -26
It may be possible to solve equations. Expressions cannot be solved until they are converted, with additional information, into equations or inequalities which may have solutions.
If both equations can be simplified to the same value, they are equal.
When given two names (variable expressions) for the same quantity, you can use algebra to solve the equation.
When given two names (variable expressions) for the same quantity, you can use algebra to solve the equation.