A piecewise function [tex][tex]$f(x)$[/tex][/tex] is defined as shown.

[tex]\[
f(x)=\left\{\begin{array}{ll}
-\frac{5}{4} x + 90, & 0 \leq x \ \textless \ 40 \\
-\frac{3}{8} x + 75, & 40 \leq x \leq 200
\end{array}\right.
\][/tex]

Which table could be used to graph a piece of the function?

[tex]\[
\begin{tabular}{|c|c|}
\hline
[tex]$x$[/tex] & [tex]$y$[/tex] \\
\hline
0 & 90 \\
\hline
16 & 85 \\
\hline
40 & 75 \\
\hline
\end{tabular}
\][/tex]

[tex]\[
\begin{tabular}{|c|c|}
\hline
[tex]$x$[/tex] & [tex]$y$[/tex] \\
\hline
0 & 90 \\
\hline
40 & 40 \\
\hline
200 & 0 \\
\hline
\end{tabular}
\][/tex]

[tex]\[
\begin{tabular}{|c|c|}
\hline
[tex]$x$[/tex] & [tex]$y$[/tex] \\
\hline
40 & 75 \\
\hline
120 & 30 \\
\hline
200 & 0 \\
\hline
\end{tabular}
\][/tex]

[tex]\[
\begin{tabular}{|c|c|}
\hline
[tex]$x$[/tex] & [tex]$y$[/tex] \\
\hline
40 & 60 \\
\hline
160 & 15 \\
\hline
200 & 0 \\
\hline
\end{tabular}
\][/tex]



Answer :

To determine which table could be used to graph the piecewise function [tex]\( f(x) \)[/tex], we will evaluate each [tex]\( x \)[/tex]-value in the tables using the function definitions and see if the corresponding [tex]\( y \)[/tex]-values match.

The function [tex]\( f(x) \)[/tex] is defined as:
[tex]\[ f(x)=\left\{\begin{array}{ll} -\frac{5}{4} x+90, & 0 \leq x<40 \\ -\frac{3}{8} x+75, & 40 \leq x \leq 200 \end{array}\right. \][/tex]

Let's check the values in each table one by one.

### Table 1:
[tex]\[ \begin{array}{|c|c|} \hline x & y \\ \hline 0 & 90 \\ \hline 16 & 85 \\ \hline 40 & 75 \\ \hline \end{array} \][/tex]

- For [tex]\( x = 0 \)[/tex]: [tex]\( f(0) = -\frac{5}{4}(0) + 90 = 90 \)[/tex]. This matches the [tex]\( y \)[/tex]-value 90.
- For [tex]\( x = 16 \)[/tex]: [tex]\( f(16) = -\frac{5}{4}(16) + 90 = -20 + 90 = 70 \)[/tex]. This does not match the [tex]\( y \)[/tex]-value 85.
- For [tex]\( x = 40 \)[/tex]: [tex]\( f(40) = -\frac{3}{8}(40) + 75 = -15 + 75 = 60 \)[/tex]. This does not match the [tex]\( y \)[/tex]-value 75.

Since not all [tex]\( y \)[/tex]-values match, Table 1 is not correct.

### Table 2:
[tex]\[ \begin{array}{|c|c|} \hline x & y \\ \hline 0 & 90 \\ \hline 40 & 40 \\ \hline 200 & 0 \\ \hline \end{array} \][/tex]

- For [tex]\( x = 0 \)[/tex]: [tex]\( f(0) = -\frac{5}{4}(0) + 90 = 90 \)[/tex]. This matches the [tex]\( y \)[/tex]-value 90.
- For [tex]\( x = 40 \)[/tex]: [tex]\( f(40) = -\frac{3}{8}(40) + 75 = -15 + 75 = 60 \)[/tex]. This does not match the [tex]\( y \)[/tex]-value 40.
- For [tex]\( x = 200 \)[/tex]: [tex]\( f(200) = -\frac{3}{8}(200) + 75 = -75 + 75 = 0 \)[/tex]. This matches the [tex]\( y \)[/tex]-value 0.

Since not all [tex]\( y \)[/tex]-values match, Table 2 is not correct.

### Table 3:
[tex]\[ \begin{array}{|c|c|} \hline x & y \\ \hline 40 & 75 \\ \hline 120 & 30 \\ \hline 200 & 0 \\ \hline \end{array} \][/tex]

- For [tex]\( x = 40 \)[/tex]: [tex]\( f(40) = -\frac{3}{8}(40) + 75 = -15 + 75 = 60 \)[/tex]. This does not match the [tex]\( y \)[/tex]-value 75.
- For [tex]\( x = 120 \)[/tex]: [tex]\( f(120) = -\frac{3}{8}(120) + 75 = -45 + 75 = 30 \)[/tex]. This matches the [tex]\( y \)[/tex]-value 30.
- For [tex]\( x = 200 \)[/tex]: [tex]\( f(200) = -\frac{3}{8}(200) + 75 = -75 + 75 = 0 \)[/tex]. This matches the [tex]\( y \)[/tex]-value 0.

Since not all [tex]\( y \)[/tex]-values match, Table 3 is not correct.

### Table 4:
[tex]\[ \begin{array}{|c|c|} \hline x & y \\ \hline 40 & 60 \\ \hline 160 & 15 \\ \hline 200 & 0 \\ \hline \end{array} \][/tex]

- For [tex]\( x = 40 \)[/tex]: [tex]\( f(40) = -\frac{3}{8}(40) + 75 = -15 + 75 = 60 \)[/tex]. This matches the [tex]\( y \)[/tex]-value 60.
- For [tex]\( x = 160 \)[/tex]: [tex]\( f(160) = -\frac{3}{8}(160) + 75 = -60 + 75 = 15 \)[/tex]. This matches the [tex]\( y \)[/tex]-value 15.
- For [tex]\( x = 200 \)[/tex]: [tex]\( f(200) = -\frac{3}{8}(200) + 75 = -75 + 75 = 0 \)[/tex]. This matches the [tex]\( y \)[/tex]-value 0.

Since all [tex]\( y \)[/tex]-values match, Table 4 is correct.

Therefore, the table that could be used to graph a piece of the function is:
[tex]\[ \begin{array}{|c|c|} \hline x & y \\ \hline 40 & 60 \\ \hline 160 & 15 \\ \hline 200 & 0 \\ \hline \end{array} \][/tex]
So, the correct table is Table 4.