Substitution in algebra refers to substituting numbers in place of letters
Let me give you an example
If X=3, and we were given this > (Find 3X+5)
we would substitute 3 in the place of X so
(3x3)+5= 9 + 5 = 14
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Its an algebra property(: ask someone else cause i got no idea!
Substitution is used in Systems of Linear Equations. When you have two equations, such as y=3x+1 and 2y+5=9x+1, then substitution can be used. 2y could be substituted with 2(3x+1). You would have now the equation 6x+2=9x-1, which is more solvable.
pros; you will learn to be smarter. cons; you will waste ALL your time, get angry, and punch your teacher for making you do the work.
Since "pre-" means before, then pre-algebra would be before algebra. Conversely, algebra would be after pre-algebra. Generally, the next class after a pre-algebra class would be Algebra I, followed by Algebra II.
Pre-algebra preps you for algebra.2nd answer:Pre-AP-algebra is the same as Algebra I. Both are way harder than pre- algebra.