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WHAT IS A VARIABLE?
A variable is a letter that is used in Algebra to take place of a number. Often, the letter 'x' is used, but you can use any letter of the alphabet.
Whenever you see a letter in algebra, it basically means "A number goes here, but we don't know what it is yet".
LIKE TERMS
LIKE TERMS
Terms that have the same variable and are raised to the same power.
You can only ADD or SUBTRACT like terms when working in Algebra.
e.g. 5s + 3s = 8s
OR
11s + 4p + 3s = 14s + 4p
(you cannot simplify as they are not like terms)
UNLIKE TERMS
UNLIKE TERMS
Terms, which do not have the same coefficients, and cannot be raised to the same power.
You cannot ADD or SUBTRACT unlike terms, but you can multiply and divide.
e.g. 2s x 6b = 12sb
OR
6ab divided by 2a = 3b
(because the a's cancel out).
WHAT IS A COEFFICIENT?
A number or an alphabet that is multiplied by a variable.
For example, in the term 7x, 7 is the coefficient. The coefficient of x in the term 3xy is 3y.
Co means together or jointly.
Think of it as the companion of what is left in the term. So the coefficient of s in 6sy is 6y.
SUBSTITUTION
SUBSTITUTION
The name given to the process of swapping an algebraic letter for its value.
Replacing the pro-numeral (or variable) with a value.
IDENTIFYING LIKE TERMS
IDENTIFYING LIKE TERMS
VIDEO
ALGEBRA SUBSTITUTION
ALGEBRA SUBSTITUTION
VIDEO
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