# Coordinate Algebra - Unit 2: Reasoning with Equations and Inequalities

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### Algebra

The branch of mathematics that deals with relationships between numbers, utilizing letters and other symbols to represent specific sets of numbers.

### Coefficient

A number multiplied by a variable.

### Equation

A number sentence that contains an equals symbol.

### Expression

A mathematical phrase involving at least one variable and sometimes numbers and operation symbols.

### Inequality

Any mathematical sentence that contains the symbols > (greater than), < (less than), >= (greater than or equal to), <= (less than or equal to).

### Ordered Pair

A pair of numbers, (x, y), that indicates the position of a point on a Cartesian plane.

### Substitution

To replace one element of a mathematical equation or expression with another.

### Variable

A letter or symbol used to represent a number.

Example: