**Ordered pair of real numbers**: An ordered pair of** real numbers x** and** y** in which element are written in **specific order**.

**(i) (x, y)** an ordered pair in which the **first element is x** and the **second is y**.** such that (x, y) ≠ (y, x) where x ≠ y.**

**(ii) (2, 3) and (3, 2)** are two **different ordered pairs.**

**(iii) (x, y) = (m, n) only if x = m and y = n**

**Recognizing an ordered pair:**

**In the Examination room,** the chair of a student is the example of ordered pair.** For example,** the chair of the student **A is 5th** place in the third row. It makes the **ordered pair (3, 5)**. Here 3 show the number of the row and 5th show the chair number.

**Numeric Example;**

An **ordered pair (6, 7)** represent x value is equal to 6 in row or x = 6 and y value equal to 7 or y = 7 in column.

**By definition of ordered pair (6,7) ≠ (7, 6) **

**Ordered pair in Cartesian plane :**

A Cartesian plane shows one to one correspondence between the **set of ordered pair R × R = {(x, y) ∈ R}**

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