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Because variables help us solve equations and represent unknowns.

Because variables are only used in science, not in math.

Because variables are always numbers and never change.

Because variables make math more complicated for no reason.

Number of books

Number of ballpens

Number of boxes

Number of bags

m + 3

2x = 6

5y - 1

a^2 + b

Equation

Expression

Inequality

Variable

It has a variable.

It has a plus sign.

It does not have an equal sign.

It has a number.

They do not have an equal sign.

They can be simplified but not solved for a variable.

They always have an equal sign.

They can represent a value.

4x + 2

8x + 5 = 5

3x - 7

2y + 1

1

-1

2

0

Expression

Equation

Inequality

Function

3 - 2n = 1

7 - y = 5

4x + 2

n + 5

Identify variables and constants

Use mathematical operations in words

Ignore the order of operations

Translate symbols into words

Three times a number plus five

Three plus a number times five

Three times five plus a number

A number plus three times five

To formulate an equation or expression using numbers, variables, and symbols

To memorize algebraic expressions

To solve equations only

To work individually without discussion

A fixed number

A symbol that represents a value

A type of operation

A mathematical tool