The domain consists of all values of x for which there is a point on the graph. Similarly, the range applies to all the y values.
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Domain is the spectrum of values on the x-axis. Domain will be which x-values can be plugged into that equation and give an answer. Range is the same thing, but y-values. On the graph it will be the y-values that are included in the graph.
Domain is considered the x-axis. So, to find the domain, one should to read the graph from left to right.
If you can trace the graph without lifting your pencil then it is continuous.
The domain and range are the x and y coordinates of the dot, respectively.
Not necessarily. The domain could well be restricted and, in that case, so will the range.