Question

How can you determine the domain of a relation from its graph?

(I know what a domain is, and I know what a relation is, but I am confused on how to determine the domain from a graph)

Answer 1

The domain is always the x-value, correct?

Answer 2

you can look at the equation and look at the "x" values, plug in the "x" values until the equation is correct

Answer 3

yeah basically lol

Answer 4

The domain is all the possible x-values of a function.

for example the domain of y=x is all real numbers because x can be any number and the function will still hold true.
it gets trickier with trig, rational, logarithmic, exponential, and root functions that can limit your domain.

for example with y=sqrt(x), you can't have a square root of a negative number so x has to be greater than or equal to 0. That means your domain is x>=0.