This week and next 10 I learned how to find the domain and range. Domain is the set of all input values that can be used for a relation (x-value). Range is a set of all output values that are used by a relation ( y-value).
To find domain you find when it ends from the right and the left (Green). To find range look for when top and bottom ends (Purple).
Let’s start with finding the domain. We begin by finding the smallest number that touches the right or left side. The smallest number in this case is -5. Now because the dots are closed we are going to use this symbol ≤. After that we’re going to find the biggest number that touches the X axis. That number is 5 in this example. Let’s write out the equation. -5 ≤ x ≤ 5
now we are going to find the range. This time we are going to start by finding the smallest number that touches the top or bottom. The smallest number and the example is -5. Again the dots are closed so we are using ≤. Next find the biggest number. 1 is going to be our biggest number. Now put all the information together. -5 ≤ y ≤ 1
