Math 10 – Week 8

Domain And Range

Domain and range are math terms that describe what possible numbers that can be the x and y values in a graph (domain = x, Range = y)

There are two graphs in this photo. The one on top is a discrete graph and for the domain and range, you will list off all the x and y values that are used for each dot. The graph below has a line that starts at (0,2). (note: lines are just a bunch of dots but they are connected)  So for the domain, you will state that 0 is smaller than or equal to x. For the range, you will state that 1 is smaller or equal to y.

 

 

Here is some other examples of graphs. the one on the left has a domain of “All Real Numbers” because there is a slight angle to the right and left and it doesn’t have an ending dot. For the range, you will you will state that -2 is smaller or equal to y (remember, lines are just a bunch of dots connected together). The graph on the left has an open dot, this says that x or y wont be included for that specific dot. So the domain will state that 1 is only smaller than x and that x is smaller or equal to 6. The range can only be 1 because the line stays on 1 for the entire time.

 

 

Here is one last example of a graph with wavy lines (Remember, Lines are a bunch of dots that are connected). so the domain will state that -5 is smaller than or equal to x and that x is smaller or equal to 3, and the range will state that -2 is smaller or equal to y and y is smaller or equal to 5.

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