This week in math 10, we learned about domain and range.

The domain of a graph contains all the input values shown by the x-axis, and the range of a graph consists of all the output values shown by the y-axis. Domain includes looking at  points from left to right on the x axis, and range includes looking at points from lowest to highest on the y-axis. We determine the domain by looking for values of the independent variable which is X, and we determine the range by looking for the values of the dependent variable, which is Y.  Here’s an example of how to interpret domain and range from a given graph.

In the graph, we see that there is an open dot and a closed dot on the line. An open dot means < less than, and a closed dot means ≤ less than or equal to.