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Which function rule models the function over the domain specified in the table below?

\begin{tabular}{|c|c|}
\hline
[tex]$x$[/tex] & [tex]$f(x)$[/tex] \\
\hline
-7 & -11 \\
\hline
-1 & 1 \\
\hline
3 & 9 \\
\hline
4 & 11 \\
\hline
7 & 17 \\
\hline
\end{tabular}

A. [tex]$f(x) = 3x + 10$[/tex] \\
B. [tex]$f(x) = 2x + 3$[/tex] \\
C. [tex]$f(x) = 4x + 5$[/tex] \\
D. [tex]$f(x) = 3x - 10$[/tex]


Sagot :

To determine which function rule models the function over the given domain, we will check each given rule against the provided points in the table.

The given points are:
[tex]\[ \begin{array}{|c|c|} \hline x & f(x) \\ \hline -7 & -11 \\ \hline -1 & 1 \\ \hline 3 & 9 \\ \hline 4 & 11 \\ \hline 7 & 17 \\ \hline \end{array} \][/tex]

Let's test each function rule one by one:

1. Rule: [tex]\(f(x) = 3x + 10\)[/tex]
[tex]\[ \begin{align*} f(-7) &= 3(-7) + 10 = -21 + 10 = -11 \quad (\text{matches}) \\ f(-1) &= 3(-1) + 10 = -3 + 10 = 7 \quad (\text{does not match}) \\ f(3) &= 3(3) + 10 = 9 + 10 = 19 \quad (\text{does not match}) \\ f(4) &= 3(4) + 10 = 12 + 10 = 22 \quad (\text{does not match}) \\ f(7) &= 3(7) + 10 = 21 + 10 = 31 \quad (\text{does not match}) \end{align*} \][/tex]
The rule [tex]\(f(x) = 3x + 10\)[/tex] does not fit all points.

2. Rule: [tex]\(f(x) = 2x + 3\)[/tex]
[tex]\[ \begin{align*} f(-7) &= 2(-7) + 3 = -14 + 3 = -11 \quad (\text{matches}) \\ f(-1) &= 2(-1) + 3 = -2 + 3 = 1 \quad (\text{matches}) \\ f(3) &= 2(3) + 3 = 6 + 3 = 9 \quad (\text{matches}) \\ f(4) &= 2(4) + 3 = 8 + 3 = 11 \quad (\text{matches}) \\ f(7) &= 2(7) + 3 = 14 + 3 = 17 \quad (\text{matches}) \end{align*} \][/tex]
The rule [tex]\(f(x) = 2x + 3\)[/tex] fits all points.

3. Rule: [tex]\(f(x) = 4x + 5\)[/tex]
[tex]\[ \begin{align*} f(-7) &= 4(-7) + 5 = -28 + 5 = -23 \quad (\text{does not match}) \\ f(-1) &= 4(-1) + 5 = -4 + 5 = 1 \quad (\text{matches}) \\ f(3) &= 4(3) + 5 = 12 + 5 = 17 \quad (\text{does not match}) \\ f(4) &= 4(4) + 5 = 16 + 5 = 21 \quad (\text{does not match}) \\ f(7) &= 4(7) + 5 = 28 + 5 = 33 \quad (\text{does not match}) \end{align*} \][/tex]
The rule [tex]\(f(x) = 4x + 5\)[/tex] does not fit all points.

4. Rule: [tex]\(f(x) = 3x - 10\)[/tex]
[tex]\[ \begin{align*} f(-7) &= 3(-7) - 10 = -21 - 10 = -31 \quad (\text{does not match}) \\ f(-1) &= 3(-1) - 10 = -3 - 10 = -13 \quad (\text{does not match}) \\ f(3) &= 3(3) - 10 = 9 - 10 = -1 \quad (\text{does not match}) \\ f(4) &= 3(4) - 10 = 12 - 10 = 2 \quad (\text{does not match}) \\ f(7) &= 3(7) - 10 = 21 - 10 = 11 \quad (\text{does not match}) \end{align*} \][/tex]
The rule [tex]\(f(x) = 3x - 10\)[/tex] does not fit all points.

Based on this detailed step-by-step evaluation, the function rule that models the function over the domain specified in the table is:
[tex]\[ f(x) = 2x + 3 \][/tex]