how do you find the domain and range of a linear function?

Question

goformit100 · Answer

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anonymous · Answer

There are three cases: $$
y=c\
x=c\
y=mx+b
$$

anonymous · Answer

with y=mx+b.. i just dont understand how you use it

anonymous · Answer

That is: horizontal line, vertical line, and diagonal line.

anonymous · Answer

horizontal line has infinite domain and the range of one point$$
y=c
$$So the domain is $(-\infty, \infty)$ and the range is $[c,c]$

anonymous · Answer

Vertical line simply isn't a function$$
x=c
$$

anonymous · Answer

c means constant right?

anonymous · Answer

Diagonal line has infinite domain and range: $$
y=mx+b
$$ domain is $(\infty,\infty)$ range is $(\infty,\infty)$

anonymous · Answer

$c, b, m$ are constants, the only variables here are $x, y$

anonymous · Answer

sorry but i have no math problems to show.. but how would you find the d r if the y=mx=b had numbers in it or whatever

anonymous · Answer

im kinda slow >,<

anonymous · Answer

domain and range * i mean

anonymous · Answer

Well, for polynomials (a line is a polynomial), the domain is always all real numbers

anonymous · Answer

For finding the range, it really is about founding the minimum and maximum values, but lines keep going on forever so there isn't any minimum or maximum.