Look at this table:
x y
0 16
6 13
1 5
3 8
3 -9
Is this relation a function?
yes
no
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Look at this table:
x y
0 16
6 13
1 5
3 8
3 -9
Is this relation a function?
yes
no
Yes, this relation is a function.
A function is defined as a relation where each input (x-value) has exactly one output (y-value). In this table, each x-value (0, 6, 1, 3) corresponds to only one y-value. Even though the x-value 3 appears twice, it still maps to one specific y-value each time (8 and -9), so it can still be considered as a function.
Keep exploring functions, and let me know if you have more questions!