Hardy Bob
07/01/2024 · Senior High School
The equations of three lines are given below. Line \( 1: y=-\frac{4}{3} x+7 \) Line \( 2:-4 y=3 x+2 \) Line \( 3: 6 x-8 y=-8 \) For each pair of lines, determine whether they are parallel, perpendicular, or neither.
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Step-by-step Solution
To determine the relationship between the lines (whether they are parallel, perpendicular, or neither), we need to find the slopes of each line.
### Line 1:
The equation is given as:
\[
y = -\frac{4}{3} x + 7
\]
The slope \( m_1 \) of Line 1 is:
\[
m_1 = -\frac{4}{3}
\]
### Line 2:
The equation is given as:
\[
-4y = 3x + 2
\]
We can rearrange this into slope-intercept form \( y = mx + b \):
\[
y = -\frac{3}{4}x - \frac{1}{2}
\]
The slope \( m_2 \) of Line 2 is:
\[
m_2 = -\frac{3}{4}
\]
### Line 3:
The equation is given as:
\[
6x - 8y = -8
\]
We can rearrange this into slope-intercept form:
\[
-8y = -6x - 8 \quad \Rightarrow \quad y = \frac{3}{4}x + 1
\]
The slope \( m_3 \) of Line 3 is:
\[
m_3 = \frac{3}{4}
\]
### Comparing the Slopes:
1. **Line 1 and Line 2:**
- \( m_1 = -\frac{4}{3} \)
- \( m_2 = -\frac{3}{4} \)
- The product of the slopes:
\[
m_1 \cdot m_2 = -\frac{4}{3} \cdot -\frac{3}{4} = 1
\]
Since the product of the slopes is 1, Line 1 and Line 2 are **perpendicular**.
2. **Line 1 and Line 3:**
- \( m_1 = -\frac{4}{3} \)
- \( m_3 = \frac{3}{4} \)
- The product of the slopes:
\[
m_1 \cdot m_3 = -\frac{4}{3} \cdot \frac{3}{4} = -1
\]
Since the product of the slopes is -1, Line 1 and Line 3 are **perpendicular**.
3. **Line 2 and Line 3:**
- \( m_2 = -\frac{3}{4} \)
- \( m_3 = \frac{3}{4} \)
- The product of the slopes:
\[
m_2 \cdot m_3 = -\frac{3}{4} \cdot \frac{3}{4} = -\frac{9}{16}
\]
Since the product of the slopes is not -1 or 0, Line 2 and Line 3 are **neither** parallel nor perpendicular.
### Summary:
- Line 1 and Line 2: **Perpendicular**
- Line 1 and Line 3: **Perpendicular**
- Line 2 and Line 3: **Neither**
Quick Answer
Line 1 and Line 2 are perpendicular, Line 1 and Line 3 are perpendicular, and Line 2 and Line 3 are neither parallel nor perpendicular.
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