Pregunta
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nes Find an equation for the line with the civen properties. Expless ycur enswer using cither the geveral form or the slope intercept form of the equation of a ine Perpencicular to the ine \( y=-\frac{1}{2} x+1 \); containing the port \( (-2,-4) \)

Ask by John Grant. in the United States
Mar 10,2025

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The equation of the line perpendicular to \( y = -\frac{1}{2}x + 1 \) and passing through the point \((-2, -4)\) is \( y = 2x \).

Solución

We are given the line \[ y = -\frac{1}{2}x + 1 \] and we need a line that is perpendicular to it and passes through the point \((-2, -4)\). 1. **Determine the slope of the given line.** The given line is in slope-intercept form \(y = mx + b\), so the slope is \[ m = -\frac{1}{2}. \] 2. **Find the slope of the perpendicular line.** The slope of a line perpendicular to another is the negative reciprocal of the original slope. Therefore, the slope \(m_{\text{perp}}\) is \[ m_{\text{perp}} = -\frac{1}{-\frac{1}{2}} = 2. \] 3. **Use the point-slope form to write the equation.** The point-slope form is \[ y - y_1 = m(x - x_1), \] where \((x_1, y_1)\) is the given point \((-2, -4)\) and \(m = 2\). Substitute these values: \[ y - (-4) = 2(x - (-2)). \] This simplifies to \[ y + 4 = 2(x + 2). \] 4. **Simplify to slope-intercept form.** Distribute on the right side: \[ y + 4 = 2x + 4. \] Then subtract 4 from both sides: \[ y = 2x. \] Thus, an equation for the line is \[ y = 2x. \] Alternatively, in general form: \[ 2x - y = 0. \]

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To find the equation of a line that is perpendicular to the given line \( y = -\frac{1}{2}x + 1 \), we need to determine the slope of the perpendicular line. The slope of the given line is \(-\frac{1}{2}\), so the slope of the perpendicular line will be the negative reciprocal, which is 2. Now, using the point-slope form of the line equation, we can substitute the slope and the point \( (-2, -4) \) into the equation: \[ y - y_1 = m(x - x_1) \] \[ y - (-4) = 2(x - (-2)) \] This simplifies to: \[ y + 4 = 2(x + 2) \] \[ y + 4 = 2x + 4 \] \[ y = 2x + 0 \] So, the final line equation in slope-intercept form is \( y = 2x \) or you can express it in general form as \( 2x - y = 0 \). If you're ever solving for the equation of a line, keep in mind that understanding slope behavior is key! Perpendicular lines are like a dance, where the angles keep spinning into new directions, but there's always that mathematically chic negative reciprocal waiting to shine! Also, don't forget to plug-and-chug numbers for practice! You can play around with different points and slopes to build your confidence. The more you work with lines, the easier it becomes to visualize their relationships on a graph—it's like plotting out a treasure map where ‘X’ marks the spot for the hidden gems of math knowledge!

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