### Writing Equations Given a Table

Write the equation of a line that passes through the points shown in the table.

[tex]\[
\begin{array}{|c|c|}
\hline
x & y \\
\hline
-10 & 2 \\
\hline
-4 & 1 \\
\hline
8 & -1 \\
\hline
14 & -2 \\
\hline
\end{array}
\][/tex]

Which equations represent a line that passes through the points given in the table? Check all that apply.

A. [tex]\( y - 2 = -6(x + 10) \)[/tex]

B. [tex]\( y - 2 = -\frac{1}{6}(x + 10) \)[/tex]

C. [tex]\( y - 1 = -\frac{1}{6}(x + 4) \)[/tex]

D. [tex]\( y = -6x - 58 \)[/tex]

E. [tex]\( y = -\frac{1}{6}x + \frac{1}{3} \)[/tex]

F. [tex]\( y = -\frac{1}{6}x + 5 \)[/tex]



Answer :

Let's find the equation of the line that passes through the points given in the table.

[tex]\[ \begin{array}{|c|c|} \hline x & y \\ \hline -10 & 2 \\ \hline -4 & 1 \\ \hline 8 & -1 \\ \hline 14 & -2 \\ \hline \end{array} \][/tex]

### Step 1: Calculate the Slope (m)
To find the slope of the line, we can use the formula for the slope between two points [tex]\((x_1, y_1)\)[/tex] and [tex]\((x_2, y_2)\)[/tex]:

[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]

Let's use the first point [tex]\((-10, 2)\)[/tex] and the last point [tex]\((14, -2)\)[/tex]:

[tex]\[ m = \frac{-2 - 2}{14 - (-10)} = \frac{-4}{24} = -\frac{1}{6} \][/tex]

So, the slope [tex]\(m\)[/tex] is [tex]\(-\frac{1}{6}\)[/tex].

### Step 2: Find the y-intercept (b)
We use the point-slope form of the line equation [tex]\(y = mx + b\)[/tex] to find [tex]\(b\)[/tex]:

Using the point [tex]\((-10, 2)\)[/tex]:

[tex]\[ 2 = -\frac{1}{6}(-10) + b \][/tex]

[tex]\[ 2 = \frac{10}{6} + b \][/tex]

[tex]\[ 2 = \frac{5}{3} + b \][/tex]

[tex]\[ 2 - \frac{5}{3} = b \][/tex]

[tex]\[ \frac{6}{3} - \frac{5}{3} = b \][/tex]

[tex]\[ \frac{1}{3} = b \][/tex]

So, the y-intercept [tex]\(b\)[/tex] is [tex]\(\frac{1}{3}\)[/tex].

### Step 3: Write the Equation of the Line
Now that we have the slope [tex]\(m = -\frac{1}{6}\)[/tex] and the y-intercept [tex]\(b = \frac{1}{3}\)[/tex], we can write the equation of the line:

[tex]\[ y = -\frac{1}{6}x + \frac{1}{3} \][/tex]

### Step 4: Check the Given Equations
Let’s verify which of the given equations match our line’s equation [tex]\(y = -\frac{1}{6}x + \frac{1}{3}\)[/tex].

1. [tex]\(y - 2 = -6(x + 10)\)[/tex]
2. [tex]\(y - 2 = -\frac{1}{6}(x + 10)\)[/tex]
3. [tex]\(y - 1 = -\frac{1}{6}(x + 4)\)[/tex]
4. [tex]\(y = -6x - 58\)[/tex]
5. [tex]\(y = -\frac{1}{6}x + \frac{1}{3}\)[/tex]
6. [tex]\(y = -\frac{1}{6}x + 5\)[/tex]

### Verifying Each Equation:

1. [tex]\(y - 2 = -6(x + 10)\)[/tex]
- This implies a slope of [tex]\(-6\)[/tex], which is not [tex]\(-\frac{1}{6}\)[/tex]

2. [tex]\(y - 2 = -\frac{1}{6}(x + 10)\)[/tex]
- Rearranging: [tex]\(y - 2 = -\frac{1}{6}x - \frac{10}{6}\)[/tex]
- [tex]\(y = -\frac{1}{6}x - \frac{5}{3} + 2\)[/tex]
- [tex]\(y = -\frac{1}{6}x + \frac{1}{3}\)[/tex], this matches our equation.

3. [tex]\(y - 1 = -\frac{1}{6}(x + 4)\)[/tex]
- Rearranging: [tex]\(y - 1 = -\frac{1}{6}x - \frac{4}{6}\)[/tex]
- [tex]\(y = -\frac{1}{6}x - \frac{2}{3} + 1\)[/tex]
- [tex]\(y = -\frac{1}{6}x + \frac{1}{3}\)[/tex], this too matches our equation.

4. [tex]\(y = -6x - 58\)[/tex]
- This equation has a slope of [tex]\(-6\)[/tex], which is not [tex]\(-\frac{1}{6}\)[/tex]

5. [tex]\(y = -\frac{1}{6}x + \frac{1}{3}\)[/tex]
- This directly matches our derived equation.

6. [tex]\(y = -\frac{1}{6}x + 5\)[/tex]
- This has the correct slope but the intercept of [tex]\(5\)[/tex] does not match [tex]\(\frac{1}{3}\)[/tex]

### Step 5: Conclusion
The equations that match a line passing through the points in the table are:

- [tex]\(y - 2 = -\frac{1}{6}(x + 10)\)[/tex]
- [tex]\(y - 1 = -\frac{1}{6}(x + 4)\)[/tex]
- [tex]\(y = -\frac{1}{6}x + \frac{1}{3}\)[/tex]