Variable expression is
an expression containing numbers and variables (e.g., 7v), and operations that
involve numbers and variables (e.g., 2v + w or 3a - 4).
3x+4y-6z is an variable
expression. Each part is called a term.
There are three terms: 3x, 4y and 6z.
Like terms use exactly the
same letters:3a and 6a are like terms, 5ab and 7ab are like terms
but 4a and 3ab are not like terms.
Exercises: IXL - variable expressions u1,u2,u3, u4,u5 and u6.
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