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Use the given conditions to write an equation for the line in point-slope form and in slope-intercept form. Passing through \( (8,-7) \) and perpendicular to the line whose equation is \( y=\frac{1}{5} x+4 \) Write an equation for the line in point-slope form. (Simplify your answer. Use integers or fractions for any numbers in the equation.) Write an equation for the line in slope-intercept form. \( \square \) (Simplify your answer. Use integers or fractions for any numbers in the equation.)

Ask by Cole Burns. in the United States
Jan 24,2025

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Tutor-Verified Answer

Answer

**Point-Slope Form:** \( y + 7 = -5(x - 8) \) **Slope-Intercept Form:** \( y = -5x + 33 \)

Solution

To find the equation of the line that passes through the point \( (8, -7) \) and is perpendicular to the line \( y = \frac{1}{5}x + 4 \), follow these steps: ### 1. Determine the Slope of the Given Line The equation of the given line is in slope-intercept form \( y = mx + b \), where \( m \) is the slope. \[ y = \frac{1}{5}x + 4 \quad \Rightarrow \quad \text{Slope } (m_1) = \frac{1}{5} \] ### 2. Find the Slope of the Perpendicular Line Perpendicular lines have slopes that are negative reciprocals of each other. Therefore, the slope \( m_2 \) of the line perpendicular to the given line is: \[ m_2 = -\frac{1}{m_1} = -\frac{1}{\frac{1}{5}} = -5 \] ### 3. Write the Equation in Point-Slope Form The **point-slope form** of a line is given by: \[ y - y_1 = m(x - x_1) \] Using the point \( (8, -7) \) and the slope \( m = -5 \): \[ y - (-7) = -5(x - 8) \\ y + 7 = -5(x - 8) \] **Point-Slope Form:** \[ y + 7 = -5(x - 8) \] ### 4. Convert to Slope-Intercept Form To convert the equation to **slope-intercept form** \( y = mx + b \), simplify the point-slope equation: \[ y + 7 = -5(x - 8) \\ y + 7 = -5x + 40 \\ y = -5x + 40 - 7 \\ y = -5x + 33 \] **Slope-Intercept Form:** \[ y = -5x + 33 \] **Final Answers:** - **Point-Slope Form:** \( y + 7 = -5(x - 8) \) - **Slope-Intercept Form:** \( y = -5x + 33 \)

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To find the equation of the line passing through the point \( (8, -7) \) and perpendicular to the line given by \( y = \frac{1}{5} x + 4 \), we first determine the slope of the new line. Since the given line has a slope of \( \frac{1}{5} \), the slope of the line that is perpendicular to it will be the negative reciprocal. Therefore, the slope of the new line is \( -5 \). **Point-slope form**: The point-slope form of a line is given by the equation: \[ y - y_1 = m(x - x_1) \] Plugging in the point \( (8, -7) \) and the slope \( -5 \), we have: \[ y - (-7) = -5(x - 8) \] This simplifies to: \[ y + 7 = -5(x - 8) \] **Slope-intercept form**: To convert this to slope-intercept form \( y = mx + b \), we distribute the \( -5 \): \[ y + 7 = -5x + 40 \] Now, bring \( 7 \) to the other side: \[ y = -5x + 40 - 7 \] Simplifying further gives us: \[ y = -5x + 33 \] So, the equations are: Point-slope form: \( y + 7 = -5(x - 8) \) Slope-intercept form: \( y = -5x + 33 \)

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