1
Q
Formula
A
An equation linking sets of physical variables. Plural: formulae.
2
Q
Expression
A
A mathematical form expressed symbolically.
Examples: 7+3; a^2+b^2
3
Q
Substitution
A
In Algebra “Substitution” means putting numbers where the letters are.
Example: If x=5, then what is x + ^10/_x ?
Put “5” where “x” is: 5 + ^10/_5 = 7
4
Q
Variable
A
In algebra, a variable is a symbol that stands for an unknown quantity
5
Q
Subject
A
The subject of a formula is the variable that is being worked out.
For example,
A=bh
(area = base x height)
The subject of the formula is A
Year 8
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