Given A (6, –2) and B (-1,2). enter the equation of the line through point B and perpendicular to AB in slope-intercept form.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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**Given \( A(6, -2) \) and \( B (-1, 2) \), enter the equation of the line through point \( B \) and perpendicular to \( AB \) in slope-intercept form.**

**Instructions:**
To find the equation of the line through point \( B \) and perpendicular to \( AB \) in slope-intercept form (\( y = mx + b \)), follow these steps:

1. **Find the slope of line \( AB \):**
   - Use the formula for the slope \( m \) between two points \((x_1, y_1)\) and \((x_2, y_2)\): 
     \[
     m = \frac{y_2 - y_1}{x_2 - x_1}
     \]
   - Substituting \( A(6, -2) \) and \( B(-1, 2) \) into the formula gives:
     \[
     m_{AB} = \frac{2 - (-2)}{-1 - 6} = \frac{4}{-7} = -\frac{4}{7}
     \]

2. **Find the slope of the line perpendicular to \( AB \):**
   - The slope of the perpendicular line is the negative reciprocal of \( m_{AB} \). So, if \( m_{AB} = -\frac{4}{7} \), the slope \( m_\perp \) of the perpendicular line is:
     \[
     m_\perp = \frac{7}{4}
     \]

3. **Use point \( B (-1, 2) \) and the perpendicular slope to find the equation:**
   - Substitute \( B (-1, 2) \) and \( m_\perp = \frac{7}{4} \) into the point-slope form equation \( y - y_1 = m(x - x_1) \):
     \[
     y - 2 = \frac{7}{4}(x + 1)
     \]

4. **Convert to slope-intercept form (\( y = mx + b \)):**
   - Distribute \(\frac{7}{4}\) and then solve for \( y \):
     \[
     y - 2 = \frac{7}{4}x + \frac{7}{4
Transcribed Image Text:**Given \( A(6, -2) \) and \( B (-1, 2) \), enter the equation of the line through point \( B \) and perpendicular to \( AB \) in slope-intercept form.** **Instructions:** To find the equation of the line through point \( B \) and perpendicular to \( AB \) in slope-intercept form (\( y = mx + b \)), follow these steps: 1. **Find the slope of line \( AB \):** - Use the formula for the slope \( m \) between two points \((x_1, y_1)\) and \((x_2, y_2)\): \[ m = \frac{y_2 - y_1}{x_2 - x_1} \] - Substituting \( A(6, -2) \) and \( B(-1, 2) \) into the formula gives: \[ m_{AB} = \frac{2 - (-2)}{-1 - 6} = \frac{4}{-7} = -\frac{4}{7} \] 2. **Find the slope of the line perpendicular to \( AB \):** - The slope of the perpendicular line is the negative reciprocal of \( m_{AB} \). So, if \( m_{AB} = -\frac{4}{7} \), the slope \( m_\perp \) of the perpendicular line is: \[ m_\perp = \frac{7}{4} \] 3. **Use point \( B (-1, 2) \) and the perpendicular slope to find the equation:** - Substitute \( B (-1, 2) \) and \( m_\perp = \frac{7}{4} \) into the point-slope form equation \( y - y_1 = m(x - x_1) \): \[ y - 2 = \frac{7}{4}(x + 1) \] 4. **Convert to slope-intercept form (\( y = mx + b \)):** - Distribute \(\frac{7}{4}\) and then solve for \( y \): \[ y - 2 = \frac{7}{4}x + \frac{7}{4
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