The table below shows how much Joe earns, [tex]\(y\)[/tex], after working [tex]\(x\)[/tex] hours.

Joe's Earnings
[tex]\[
\begin{array}{|c|c|}
\hline
\text{Hours worked} & \text{Money earned} \\
\hline
4 & \$30 \\
\hline
10 & \$75 \\
\hline
12 & \$90 \\
\hline
22 & \$165 \\
\hline
\end{array}
\][/tex]

The relationship between money earned and hours worked is linear. Joe computes the slope between [tex]\((4, 30)\)[/tex] and [tex]\((12, 90)\)[/tex], then computes the slope between [tex]\((4, 30)\)[/tex] and [tex]\((10, 75)\)[/tex]. How do the two slopes compare?

A. The slope between [tex]\((4, 30)\)[/tex] and [tex]\((12, 90)\)[/tex] is greater because the ordered pairs are farther apart on the [tex]\(x\)[/tex]-axis.

B. The slope between [tex]\((4, 30)\)[/tex] and [tex]\((12, 90)\)[/tex] is greater because the ordered pairs are farther apart on the [tex]\(y\)[/tex]-axis.

C. The slope between [tex]\((4, 30)\)[/tex] and [tex]\((12, 90)\)[/tex] and between [tex]\((4, 30)\)[/tex] and [tex]\((10, 75)\)[/tex] is the same.

D. The slope between [tex]\((4, 30)\)[/tex] and [tex]\((12, 90)\)[/tex] is less because 4 is a factor of 12 and 30 is a factor of 90.



Answer :

To determine how the slopes between the given points compare, let's calculate the slopes step-by-step. Given the points [tex]\((4,30)\)[/tex], [tex]\((10,75)\)[/tex], and [tex]\((12,90)\)[/tex]:

1. Calculating the slope between [tex]\((4,30)\)[/tex] and [tex]\((12,90)\)[/tex]:

The formula for the slope [tex]\(m\)[/tex] between two points [tex]\((x_1, y_1)\)[/tex] and [tex]\((x_2, y_2)\)[/tex] is:
[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]
Plugging in the coordinates [tex]\((4, 30)\)[/tex] and [tex]\((12, 90)\)[/tex]:
[tex]\[ m_1 = \frac{90 - 30}{12 - 4} = \frac{60}{8} = 7.5 \][/tex]

2. Calculating the slope between [tex]\((4,30)\)[/tex] and [tex]\((10,75)\)[/tex]:

Using the same slope formula with the coordinates [tex]\((4, 30)\)[/tex] and [tex]\((10, 75)\)[/tex]:
[tex]\[ m_2 = \frac{75 - 30}{10 - 4} = \frac{45}{6} = 7.5 \][/tex]

3. Comparing the two slopes:

From the calculations, we see that:
[tex]\[ m_1 = 7.5 \quad \text{and} \quad m_2 = 7.5 \][/tex]
Therefore, the slopes between the points [tex]\((4,30)\)[/tex] and [tex]\((12,90)\)[/tex], and between [tex]\((4,30)\)[/tex] and [tex]\((10,75)\)[/tex] are indeed the same.

4. Conclusion:

Based on our calculations, the correct statement is:
[tex]\[ \text{The slope between (\(4,30\)) and (\(12,90\)) and between (\(4,30\)) and (\(10,75\)) is the same.} \][/tex]

Thus, the correct option is:
[tex]\[ \textbf{The slope between (4,30) and (12,90) and between (4,30) and (10,75) is the same.} \][/tex]

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