Domain and range of (1, 4), (2, 5), (3, 4)

Step by step, with the reason for every step · Domain and range · Algebra 2

Step by step

Question: find the domain and range of the points (1, 4), (2, 5), (3, 4).

(1, 4), (2, 5), (3, 4)

The domain is all the x's we can put in.

The range is all the answers, the y's, that can come out.

domain = the x's that can go in

range = the y's that can come out

The first number of each point is its x: 1, 2 and 3.

So the domain is {1, 2, 3}.

domain = { 1, 2, 3 }

The second number of each point is its y: 4, 5 and 4.

4 is there twice.

We write it once.

So the range is {4, 5}.

range = { 4, 5 }

Let's look back.

First: read the x's.

Last: read the y's.

Answer

range = { 4, 5 }

Try this one yourself, then check:

Find the domain and range of the points (1, 5), (2, 8), (3, 5)

Show the answer

domain: {1, 2, 3}, range: {5, 8}