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Which set of points does not represent a one-to-one function?

{(9,0),(5,2),(0,8),(2,4),(6,3)}

{(0,6),(1,4),(2,9),(6,1),(3,5)}

{(2,0),(6,8),(8,7),(9,5),(5,3)}

{(2,4),(5,8),(9,5),(6,0),(6,9)}

Which set of points does not represent a one-to-one function?\newline{(9,0),(5,2),(0,8),(2,4),(6,3)} \{(9,0),(5,2),(0,8),(2,4),(6,3)\} \newline{(0,6),(1,4),(2,9),(6,1),(3,5)} \{(0,6),(1,4),(2,9),(6,1),(3,5)\} \newline{(2,0),(6,8),(8,7),(9,5),(5,3)} \{(2,0),(6,8),(8,7),(9,5),(5,3)\} \newline{(2,4),(5,8),(9,5),(6,0),(6,9)} \{(2,4),(5,8),(9,5),(6,0),(6,9)\}

Full solution

Q. Which set of points does not represent a one-to-one function?\newline{(9,0),(5,2),(0,8),(2,4),(6,3)} \{(9,0),(5,2),(0,8),(2,4),(6,3)\} \newline{(0,6),(1,4),(2,9),(6,1),(3,5)} \{(0,6),(1,4),(2,9),(6,1),(3,5)\} \newline{(2,0),(6,8),(8,7),(9,5),(5,3)} \{(2,0),(6,8),(8,7),(9,5),(5,3)\} \newline{(2,4),(5,8),(9,5),(6,0),(6,9)} \{(2,4),(5,8),(9,5),(6,0),(6,9)\}
  1. Function Definition: A one-to-one function, also known as an injective function, is a function where each xx-value is paired with exactly one unique yy-value, and no yy-value is repeated. To determine which set of points does not represent a one-to-one function, we need to check if any yy-value is repeated for different xx-values in each set.
  2. Set 11 Analysis: Let's examine the first set of points: (9,0),(5,2),(0,8),(2,4),(6,3){(9,0),(5,2),(0,8),(2,4),(6,3)}. We need to check if any yy-value is repeated. Looking at the yy-values: 00, 22, 88, 44, 33, we can see that all yy-values are unique. This set represents a one-to-one function.
  3. Set 22 Analysis: Now, let's examine the second set of points: (0,6),(1,4),(2,9),(6,1),(3,5){(0,6),(1,4),(2,9),(6,1),(3,5)}. We need to check if any yy-value is repeated. Looking at the yy-values: 66, 44, 99, 11, 55, we can see that all yy-values are unique. This set represents a one-to-one function.
  4. Set 33 Analysis: Next, let's examine the third set of points: (2,0),(6,8),(8,7),(9,5),(5,3){(2,0),(6,8),(8,7),(9,5),(5,3)}. We need to check if any yy-value is repeated. Looking at the yy-values: 00, 88, 77, 55, 33, we can see that all yy-values are unique. This set represents a one-to-one function.
  5. Set 44 Analysis: Finally, let's examine the fourth set of points: (2,4),(5,8),(9,5),(6,0),(6,9){(2,4),(5,8),(9,5),(6,0),(6,9)}. We need to check if any yy-value is repeated. Looking at the yy-values: 4,8,5,0,94, 8, 5, 0, 9, we can see that all yy-values are unique. However, we notice that the xx-value 66 is repeated for two different yy-values (00 and 99). This set does not represent a one-to-one function because the same xx-value (66) is associated with more than one yy-value.

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