algebra

Hello there can someone help me check these 2 questions please.
1. Determine if the set of points (−1,3), (2,5), (3,8), and (4,5) is a function. Explain.
A. The set of points is a function because each value in the domain corresponds to exactly one value in the range.
B. The set of points is not a function because the range consists of the value 5 two times.
C. The set of points is not a function because each value in the domain corresponds to exactly one value in the range.
D. The set of points is a function because the range consists of the value 5 two times.
2. Isa and Benny are both in Mrs. Johnson's class, Patrick is in Mr. Jimenez's class, and Jose is in Mrs. True's class. Is this relation a function? Explain.
A. This relation is not a function because both Isa and Benny are in Mrs. Johnson's class.
B. This relation is a function because each student is in exactly one teacher's class.
C. This relation is not a function because each student is in exactly one teacher's class.
D. This relation is a function because both Isa and Benny are in Mrs. Johnson's class
My answers 1.d 2.d Thank you so much.

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  1. nope. 1A
    Which values are in the range and how many times does not matter. What matters is that each value in the domain is used only once.

    nope 2B, for the same reason as #1
    Assuming that the relation is "is in the class of"

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    oobleck
  2. Oobleck is right thanks!

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