A Closed Circle means that that number is INCLUDED in the line of numbers.
An OPEN circle means the line of numbers go up to the given number , BUT does NOT include the given number.
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If you are talking about a graph, a solid circle means that point, say (3,4), is included, and an open circle it is not included
A line plot is used to organize data while it is being collected. It is a type of graph that uses a number line to show the frequency of data.
Means nothing to me. But the value called "pi" is 3.1415926535897932385 (rounded on the last digit). This number is the ratio of a circle's AREA divided by the DIAMETER.
Graphing a line on the coordinate plane is the two-dimensional equivalent to marking a point on a number line. It just means to graph your line with respect to the x and y axes.
You can always find out the slope of a line by looking at the number before the variable. As you can see, there is no number in front of x, so how is there a slope? If X is ever alone, that means that there is one X, so the slope of the line is 1.