heyy, ok so imma leave the answers so u can check with them, and ill write it out so u don't get confused up on the answer choices
(the answers are from the literal quick check btw)
also, this video is really helpful, helped me answer all of them
(look up virtual nerd, how do you figure out if a relation is a function?)(lmao, not allowed to post urls on here)
1. By determining if each value from one set maps to another set such that each element of the domain pairs with exactly one element of the range.
-explanation- there can be variation of numbers in the y coordinates, but not in the x.
2.It does not represent a function. The domain value of 2 corresponds to two values within the range.
-explanation- there are two 2's in the x coordinates. yes, there is a repeat of 2 fives in the y, but that's ok, REPEATS ONLY MATTER IN THE X COORDINATES
3. This relation is a function. Each name in the domain corresponds to exactly one element in the range of blood types.
-EXPLANATION- ok, so when you write it out (that's what i did for like, all of them) you see there are no repeats whatsoever, making this a function
4. The set of points is a function because each value in the domain corresponds to exactly one value in the range.
-explanation- no repeats in the x coordinates, but there is in the y coordinates, but again thats fine, as long as there is only one of each in the x coordinates
5. This relation is a function because each student is in exactly one teacher's class.
-explanation- there is a repeat in the y coordinates, but none in the x. so it's a function!
heres me tyrna explain the whole graph thing that i keep mentioning. ok so take number 5 as an example.
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.
x | y
isa |johnson's class
benny |johnsons class
patrick|Jimenez's class
jose | True's class
so you see, there is no repeats in the x column. making it a function. but it's 100% ok for there to be a repeat in the y column.
again i REALLY recommend watching that video for anybody who doesn't understand this, cuz this will be repeated for like, the rest of high school.
hope this helped!!