Question
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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 \( (-3,-7) \) and parallel to the line whose equation is \( y=-4 x+3 \) Write an equation for the line in point-slope form. \( \square \) (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 Matthews Ward. in the United States
Feb 03,2025

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Tutor-Verified Answer

Answer

**Point-Slope Form:** \( y + 7 = -4(x + 3) \) **Slope-Intercept Form:** \( y = -4x - 19 \)

Solution

To find the equation of the line that passes through the point \((-3, -7)\) and is parallel to the line \(y = -4x + 3\), follow these steps: ### 1. Determine the Slope Since the lines are parallel, they have the **same slope**. The given line \(y = -4x + 3\) has a slope (\(m\)) of \(-4\). ### 2. Point-Slope Form The **point-slope form** of a line is: \[ y - y_1 = m(x - x_1) \] Where \((x_1, y_1)\) is a point on the line and \(m\) is the slope. Using the point \((-3, -7)\) and the slope \(-4\): \[ y - (-7) = -4(x - (-3)) \] Simplify: \[ y + 7 = -4(x + 3) \] **Point-Slope Form:** \[ y + 7 = -4(x + 3) \] ### 3. Slope-Intercept Form The **slope-intercept form** of a line is: \[ y = mx + b \] Where \(m\) is the slope and \(b\) is the y-intercept. We already know \(m = -4\). To find \(b\), plug in the point \((-3, -7)\): \[ -7 = -4(-3) + b \] \[ -7 = 12 + b \] \[ b = -19 \] **Slope-Intercept Form:** \[ y = -4x - 19 \] ### Final Answers - **Point-Slope Form:** \( y + 7 = -4(x + 3) \) - **Slope-Intercept Form:** \( y = -4\,x - 19 \)

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Bonus Knowledge

To find the equation of the line passing through the point (-3, -7) and parallel to \( y = -4x + 3 \), we first note that parallel lines have the same slope. The slope of the given line is -4. **Point-slope form:** We can use the point-slope formula \( y - y_1 = m(x - x_1) \), where \( m \) is the slope and \( (x_1, y_1) \) is the point (-3, -7). Substituting the values, we get: \[ y + 7 = -4(x + 3) \] **Slope-intercept form:** Now, we can convert it to slope-intercept form (\( y = mx + b \)). Distributing on the right side: \[ y + 7 = -4x - 12 \] Now, subtracting 7 from both sides gives us: \[ y = -4x - 19 \] So, the equations are: 1. Point-slope form: \( y + 7 = -4(x + 3) \) 2. Slope-intercept form: \( y = -4x - 19 \)

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