A line passes through the points in this table.

\begin{tabular}{|c|c|}
\hline\( x \) & \( y \) \\
\hline 4 & -12 \\
\hline 16 & -2 \\
\hline 28 & 8 \\
\hline 40 & 18 \\
\hline
\end{tabular}
What is the slope of the line?
Write your answer as an integer or simplified fraction.

1 answer

To find the slope of the line that passes through the points in the table, we can use the slope formula:

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

We can choose any two points from the table. Let's use the first two points: \((4, -12)\) and \((16, -2)\).

Substituting these points into the formula, we have:

  • \(x_1 = 4\)
  • \(y_1 = -12\)
  • \(x_2 = 16\)
  • \(y_2 = -2\)

Now we can substitute into the slope formula:

\[ m = \frac{-2 - (-12)}{16 - 4} \] \[ m = \frac{-2 + 12}{12} \] \[ m = \frac{10}{12} \] \[ m = \frac{5}{6} \]

The slope of the line is \(\frac{5}{6}\).

To verify if this slope is consistent with the other pairs of points, we can also calculate the slope using the second pair \((16, -2)\) and \((28, 8)\):

  • \(x_1 = 16\)
  • \(y_1 = -2\)
  • \(x_2 = 28\)
  • \(y_2 = 8\)

Calculating the slope:

\[ m = \frac{8 - (-2)}{28 - 16} \] \[ m = \frac{8 + 2}{12} \] \[ m = \frac{10}{12} = \frac{5}{6} \]

Now using the pair \((28, 8)\) and \((40, 18)\):

  • \(x_1 = 28\)
  • \(y_1 = 8\)
  • \(x_2 = 40\)
  • \(y_2 = 18\)

Calculating the slope again:

\[ m = \frac{18 - 8}{40 - 28} \] \[ m = \frac{10}{12} = \frac{5}{6} \]

Since the slope calculated from all pairs is consistent, we confirm that the slope of the line is:

\[ \boxed{\frac{5}{6}} \]

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