# How to Define the Domain of a Graph

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Define the domain of a graph by calculating all of the X values on a standard graph. Find out how to plot points on the X and Y axis of a graph and determine the domain with information from a tutor in this free video on graphs.

Part of the Video Series: Math Lessons
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## Video Transcript

Hi, my name is Samir Malik. And I'm a private tutor for Middle school and High school students in the Austin area. Today, we're going to be discussing the Domain of a Graph. And how to calculate the domain of a graph. Now first of all, the domain of a graph is all the X values in a graph. So as we know, in our graphs we have. A traditional two axes graph will have the X values and the Y values. In a three axes graph, you have the X values, Y values and Z values. But what I will illustrate today, is a traditional graph. With X values and Y values. And we'll go ahead and draw a line. And we'll calculate from that, what the domain of the graph is. So we have our graph. We have the X axis, Y axis. We have the points one, two and three. We have the points one, two and three. We this, one, one. We another pint, two, two. And we have another point three, three. And we know that for X values equals one, two and three. For the Y values we have one, two and three. So the domain of this graph is going to equal one, two and three. Because the domain is all the X values of this graph. Which we have drawn. So where we're able to understand the domain of a graph. And understand the X values.

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