Domain and Range

[Brooke14]

Can you please check this problem and let me know if I got the right answer?

Identify the domain and range. Determine if it is a function and tell why.

(3,0), (-2,1), (0,-6), (-3,0), (-4,-2), (0,1), (5,3), (3,6)

answer:

D -4>5
R -6>6

thx

 

[pka]

Can you please check this problem and let me know if I got the right answer?
Identify the domain and range. Determine if it is a function and tell why.
(3,0), (-2,1), (0,-6), (-3,0), (-4,-2), (0,1), (5,3), (3,6)

The domain is the set of first terms. The range is the set of second terms.
So your answers are incorrect because neither is a set.
The collection of pairs is a function if no two pairs have the same first term.

 

[HallsofIvy]

Can you please check this problem and let me know if I got the right answer?

Identify the domain and range. Determine if it is a function and tell why.

(3,0), (-2,1), (0,-6), (-3,0), (-4,-2), (0,1), (5,3), (3,6)

answer:

D -4>5

I have no idea what you mean by this! It looks like you are saying that -4 is larger than 5 but that certainly is not true! You probably mean "-4 to 5" (which might better be indicated by "-4=> 5") but that is not correct either- for two reasons. First, "-4 to 5" does not state that the numbers are integers so might be interpreted to mean that "1/2" is in the domain, which is not true. But even if accept that you mean integers, that is not true because -1 is NOT in the domain. The best way to give the domain for this is to list the first numbers in the pairs: {3, -2, 0, -3, -4, 0, 5, 3}.

R -6>6

Same point as before. If you mean "all integers from -6 to 6" that is not correct because -5, 05, etc are not in range. Just list the second numbers:
{0, 1, -6, -2, 1, 3, 6}

thx

You don't say anything about whether this is a function or not. Consider that both (0, -6) and (0, 1) are in the set.