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Which of the following represents a function?

A.

B. [tex]$\{(-1,-11),(0,-7),(1,-3),(-1,5),(2,0)\}$[/tex]

C.
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline
[tex]$x$[/tex] & -18 & -13 & 3 & 5 & -6 & 3 \\
\hline
[tex]$y$[/tex] & -7 & -2 & 14 & 16 & 5 & 19 \\
\hline
\end{tabular}

D.

Sagot :

Let's analyze each option given to determine if it represents a function. A set of ordered pairs represents a function if each input (x-value) is mapped to exactly one output (y-value). This means that no x-value can be associated with more than one y-value.

Let's break down each option individually:

### Option A
No information is provided, so it cannot be analyzed.

### Option B: [tex]$\{(-1,-11),(0,-7),(1,-3),(-1,5),(2,0)\}$[/tex]

In this set of ordered pairs, we have:
[tex]\[ \begin{align*} (-1, -11), \\ (0, -7), \\ (1, -3), \\ (-1, 5), \\ (2, 0) \end{align*} \][/tex]

- The x-value [tex]\( -1 \)[/tex] is paired with both [tex]\( -11 \)[/tex] and [tex]\( 5 \)[/tex].

Since the x-value [tex]\( -1 \)[/tex] is associated with two different y-values ([tex]\(-11\)[/tex] and 5), this set of ordered pairs does not represent a function.

### Option C
[tex]\[ \begin{array}{|c|c|c|c|c|c|c|} \hline x & -18 & -13 & 3 & 5 & -6 & 3 \\ \hline y & -7 & -2 & 14 & 16 & 5 & 19 \\ \hline \end{array} \][/tex]

We observe the following pairs:
[tex]\[ \begin{align*} (-18, -7), \\ (-13, -2), \\ (3, 14), \\ (5, 16), \\ (-6, 5), \\ (3, 19) \end{align*} \][/tex]

- The x-value [tex]\( 3 \)[/tex] is paired with both [tex]\( 14 \)[/tex] and [tex]\( 19 \)[/tex].

Since the x-value [tex]\( 3 \)[/tex] is associated with two different y-values ([tex]\(14\)[/tex] and [tex]\(19\)[/tex]), this set of ordered pairs does not represent a function.

### Option D
No information is provided, so it cannot be analyzed.

### Summary
Based on the analysis, Option B does not represent a function because there is a repeated x-value associated with different y-values. This is confirmed by finding that the x-value [tex]\(-1\)[/tex] is paired with both [tex]\(-11\)[/tex] and [tex]\(5\)[/tex], which violates the definition of a function.

Therefore, among the provided options, Option B does not represent a function.