Introduction to Linear Functions

Interpreting a Function

This table displays a scenario.

\begin{tabular}{|c|c|}
\hline
Gallons, [tex]$g$[/tex] & Liters, [tex]$l$[/tex] \\
\hline
1 & 3.79 \\
\hline
2 & 7.58 \\
\hline
3 & 11.37 \\
\hline
4 & 15.16 \\
\hline
5 & 18.95 \\
\hline
6 & 22.74 \\
\hline
\end{tabular}

What can be determined from the table? Check all that apply.

- The independent variable is the number of gallons.
- Liters is a function of gallons.
- The equation [tex]$l = 3.79g$[/tex] represents the table.
- As the number of gallons increases, the number of liters increases.
- This is a function because every input has exactly one output.



Answer :

Certainly! Let's take a detailed look at the table and the corresponding information to determine what conclusions can be drawn.

[tex]\[ \begin{array}{|c|c|} \hline \text{Gallons, } g & \text{Liters, } l \\ \hline 1 & 3.79 \\ \hline 2 & 7.58 \\ \hline 3 & 11.37 \\ \hline 4 & 15.16 \\ \hline 5 & 18.95 \\ \hline 6 & 22.74 \\ \hline \end{array} \][/tex]

1. The independent variable is the number of gallons:

The independent variable is the one that is being manipulated or controlled in an experiment or scenario. In this table, the number of gallons \( g \) is the independent variable because this is what we are inputting or changing.

2. Liters is a function of Gallons:

The dependent variable is the one that depends on the independent variable. Here, the amount of liters \( l \) depends on the number of gallons \( g \). Therefore, liters can be considered a function of gallons.

3. The equation \( l = 3.79 g \) represents the table:

When we look at the table, we see that for each gallon value \( g \), the corresponding liters \( l \) is given. If we multiply each gallon value by 3.79, the result matches the liters value exactly:

[tex]\[ \begin{align*} 1 \cdot 3.79 &= 3.79 \\ 2 \cdot 3.79 &= 7.58 \\ 3 \cdot 3.79 &= 11.37 \\ 4 \cdot 3.79 &= 15.16 \\ 5 \cdot 3.79 &= 18.95 \\ 6 \cdot 3.79 &= 22.74 \\ \end{align*} \][/tex]

Therefore, the equation \( l = 3.79 g \) accurately represents the relationship between gallons and liters in the table.

4. As the number of gallons increases, the number of liters increases:

Observing the table, it is clear that as the number of gallons (\( g \)) increases, so does the value of liters (\( l \)). This indicates a direct relationship where an increase in the independent variable leads to an increase in the dependent variable.

5. This is a function because every input has exactly one output:

In the table, each value of \( g \) (gallons) corresponds to exactly one value of \( l \) (liters). This meets the definition of a function, where every input has a unique output.

Thus, the correct statements we can determine from the table are:

- The independent variable is the number of gallons.
- Liters is a function of Gallons.
- The equation \( l = 3.79 g \) represents the table.
- As the number of gallons increases, the number of liters increases.
- This is a function because every input has exactly one output.