# Math 10 Week 9: Domain and Range

Domain is a term that is used to describe all the numbers used on the x axis, and range describes all the numbers used on the y axis.

For example, if you are given the examples (5, 4), (3,2), and (6, 1), the 5, 3, and 6 would be the domain and the 4, 2, and 1 are the range. Whatever is on the left side is apart of the domain, and whatever is on the right side would be apart of the range.

On a graph, you may see dots, lines with an arrow(s), or dots and lines.

If its just dots, then find the coordinates then find the domain and range.

If there are dots and lines, you will need to write the starts and ends, here’s an example. Let’s say the line starts at an open dot with the coordinates (-5, -1), and ends at an open dot (3, 4). You would write that as -5<x>3 for the domain, and -1<y>4

If its just lines with one or more arrows, then it will be continuous in one or two directions. For example, It starts with a open dot on (-3, 1) and goes to the top right corner and has an arrow at the end. You would write that as -3<x for the domain and 1<x for the range.

That’s all for this week, so next time I will be discussing… some type of function related topic. See ya next week!