RTCNTC said:I know about WolframAlpha but I am not looking just for the answer. I need an explanation as I travel through my precalculus textbook.
A number line is a visual representation of numbers placed in order on a straight line. It is used to show the relationship between numbers and their placement in relation to zero.
To show intervals on a number line, mark the starting and ending points of the interval with open or closed circles, depending on whether the endpoints are included or not. Then, draw a line between the two points to represent the interval.
The purpose of showing intervals on a number line is to visually represent a range of numbers. It helps to understand the distance between numbers, as well as the relationship between them.
An open interval on a number line is represented by using open circles to indicate that the endpoints are not included in the interval. A closed interval is represented by using closed circles to indicate that the endpoints are included in the interval.
Showing intervals on a number line can be helpful in solving equations by visually representing the possible values of the variable. It can also help in determining whether a certain value is included or excluded from the solution set.