## What order are coordinates on a graph?

The order in which you write x- and y-coordinates in an ordered pair is very important. The x-coordinate always comes first, followed by the y-coordinate. As you can see in the coordinate grid below, the ordered pairs (3,4) and (4,3) are two different points!

**How do you plot coordinates?**

How to read and plot coordinates. Coordinates are always written in brackets, with the two numbers separated by a comma. Coordinates are ordered pairs of numbers; the first number number indicates the point on the x axis and the second the point on the y axis.

### What is an ordered pair formula?

Ordered pairs are often used to represent two variables. When we write (x, y) = (7, – 2), we mean x = 7 and y = – 2. The number which corresponds to the value of x is called the x-coordinate and the number which corresponds to the value of y is called the y-coordinate.

**What is the set of all second coordinates of ordered pairs?**

range of

The set of all first components of the ordered pairs is called the domain of the relation and the set of all second components of the ordered pairs is called the range of the relation.

#### Why are coordinates called ordered pairs?

An ordered pair is also known as a coordinate pair because it consists of x- and y-coordinates. For example, we can represent the point (3,−1) in the plane by moving three units to the right of the origin in the horizontal direction, and one unit down in the vertical direction.

**What is the first coordinate set?**

domain

The domain of the relation is the set of all possible first coordinates. When we graph, we think of the first coordinate in terms of x . The range of the relation is the set of all possible second coordinates.

## Can a function have two ordered pairs of coordinates?

A function can’t have two ordered pairs with the same first coordinate and different second coordinates. Let’s think about what would happen if two such points were on a graph. Notice that if there are two points with the same first coordinate and different second coordinates, we can draw a vertical line through them.

**How are ordered pairs used in a table?**

Thus, in ordered pairs, no two ordered pairs can have the same first coordinate and different second coordinates. In tables, no two entries can have the same input with two different outputs. In graphs, we can use the vertical line test by making sure that a vertical line drawn anywhere on the graph only intersects the graph once.

### How are linear equations graphed on a coordinate plane?

The linear equations x = 2 x = 2 and y =−3 y = − 3 only have one variable in each of them. However, because these are linear equations, then they will graph on a coordinate plane just as the linear equations above do. Just think of the equation x= 2 x = 2 as x= 0y+2 x = 0 y + 2 and think of y= −3 y = − 3 as y = 0x–3 y = 0 x – 3.

**Can a graph be used to represent a function?**

We can also represent functions using graphs by plotting all the ordered pairs of a function on a coordinate axis. For example, consider the function y = 2 x + 1. We graph this by graphing all the ordered pairs that satisfy the equation. But how do we know this is a function?