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4. Which equation represents a line perpendicular to the line whose equation is \( 2 x+3 y=12 \) ? \( \begin{array}{ll}\text { (1) } 6 y=-4 x+12 & \text { (3) } 2 y=-3 x+6 \\ \text { (2) } 2 y=3 x+6 & \text { (4) } 3 y=-2 x+12\end{array} \)

Ask by Rose Best. in the United States
Mar 20,2025

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Answer

The equation \( 2y = 3x + 6 \) is perpendicular to \( 2x + 3y = 12 \).

Solution

To find the equation of a line that is perpendicular to the line given by the equation \( 2x + 3y = 12 \), we need to follow these steps: 1. **Convert the given equation to slope-intercept form (y = mx + b)** to find its slope. 2. **Determine the slope of the perpendicular line**. The slope of a line perpendicular to another is the negative reciprocal of the original line's slope. 3. **Check each of the provided options** to see which one has the correct slope. ### Step 1: Convert to slope-intercept form Starting with the equation: \[ 2x + 3y = 12 \] We can solve for \( y \): \[ 3y = -2x + 12 \] \[ y = -\frac{2}{3}x + 4 \] From this, we see that the slope \( m \) of the original line is \( -\frac{2}{3} \). ### Step 2: Find the slope of the perpendicular line The slope of a line perpendicular to this one is the negative reciprocal of \( -\frac{2}{3} \): \[ m_{\text{perpendicular}} = \frac{3}{2} \] ### Step 3: Check the options Now we will check each of the provided options to see which one has a slope of \( \frac{3}{2} \). 1. **Option (1)**: \( 6y = -4x + 12 \) - Convert to slope-intercept form: \[ y = -\frac{4}{6}x + 2 = -\frac{2}{3}x + 2 \quad \text{(slope = } -\frac{2}{3}\text{)} \] 2. **Option (2)**: \( 2y = 3x + 6 \) - Convert to slope-intercept form: \[ y = \frac{3}{2}x + 3 \quad \text{(slope = } \frac{3}{2}\text{)} \] 3. **Option (3)**: \( 2y = -3x + 6 \) - Convert to slope-intercept form: \[ y = -\frac{3}{2}x + 3 \quad \text{(slope = } -\frac{3}{2}\text{)} \] 4. **Option (4)**: \( 3y = -2x + 12 \) - Convert to slope-intercept form: \[ y = -\frac{2}{3}x + 4 \quad \text{(slope = } -\frac{2}{3}\text{)} \] ### Conclusion The only option that has a slope of \( \frac{3}{2} \) is **Option (2)**: \( 2y = 3x + 6 \). Thus, the equation that represents a line perpendicular to the line \( 2x + 3y = 12 \) is: \[ \boxed{2y = 3x + 6} \]

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Bonus Knowledge

To find a line that is perpendicular to the line represented by the equation \( 2x + 3y = 12 \), we first need to determine its slope. Rewriting it in slope-intercept form (y = mx + b), we have \( 3y = -2x + 12 \) which simplifies to \( y = -\frac{2}{3}x + 4 \). The slope of this line is \( -\frac{2}{3} \). For a line to be perpendicular, its slope must be the negative reciprocal, which would be \( \frac{3}{2} \). Looking at the answer choices, the equation \( 2y = 3x + 6 \) (Option 2) can be solved to confirm that it has a slope of \( \frac{3}{2} \), making it the correct choice! Time to practice the art of identifying parallel and perpendicular lines! Remember, the key thing you want to do is look for those slopes: flip that fraction and change the sign! Feel free to play around with various line equations to hone your skills. It’s a fun way to engage with geometry—like creating your very own grid art with lines!

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