Domain is considered the x-axis. So, to find the domain, one should to read the graph from left to right.
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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.
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.
The domain of y = 2x is [0, +infinity].
In calculus, the domain refers to the interval that all x values fall on in a graph, equation, etc.
graph x+4<5