Question

In the expression 9+2z what is the variable?

Answer 1

To answer this question, we will define some things first.

For every mathematical expression or term, it consist of three parts:

1) Coefficient

2) Variable: a symbol that stands in for an unknown value in a mathematical expression

3) Constant

In the expression given:

`\begin{gathered} 9+2z \\ 9\text{ is the constant} \\ 2\text{ is the coefficient} \\ z\text{ is the variable} \end{gathered}`

So the variable in the expression is z.