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7. Graph the line \( 12 x+4 y=36 \)

Ask by Lane Greene. in Canada
Jan 19,2025

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Answer

To graph the line \( 12x + 4y = 36 \), first rewrite it in slope-intercept form \( y = -3x + 9 \). Plot the y-intercept at \( (0, 9) \) and another point like \( (1, 6) \), then draw a straight line through these points.

Solution

Rewrite the equation by following steps: - step0: Rewrite in slope-intercept form: \(12x+4y=36\) - step1: Move the expression to the right side: \(4y=36-12x\) - step2: Divide both sides: \(y=9-3x\) - step3: Rearrange the terms: \(y=-3x+9\) To graph the line given by the equation \( 12x + 4y = 36 \), we first convert it to slope-intercept form, which is \( y = mx + b \), where \( m \) is the slope and \( b \) is the y-intercept. 1. **Convert to Slope-Intercept Form:** - Start with the original equation: \[ 12x + 4y = 36 \] - Solve for \( y \): \[ 4y = -12x + 36 \] \[ y = -3x + 9 \] Here, the slope \( m = -3 \) and the y-intercept \( b = 9 \). 2. **Identify Key Points:** - The y-intercept is the point \( (0, 9) \). - To find another point, we can choose a value for \( x \). For example, if \( x = 1 \): \[ y = -3(1) + 9 = 6 \] So, another point is \( (1, 6) \). 3. **Plot the Points:** - Plot the points \( (0, 9) \) and \( (1, 6) \) on a graph. 4. **Draw the Line:** - Connect the points with a straight line extending in both directions. This line represents the equation \( 12x + 4y = 36 \). If you have graphing software or graph paper, you can plot these points and draw the line accordingly.

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To graph the line represented by the equation \( 12x + 4y = 36 \), you can start by rewriting it in slope-intercept form. First, isolate \( y \): \[ 4y = -12x + 36 \quad \Rightarrow \quad y = -3x + 9 \] Now, you can easily identify the slope (-3) and the y-intercept (9). This means your line will start at the point (0, 9) on the y-axis and will fall steeply as it moves right. To draw your line, plot the y-intercept and use the slope to find another point: from (0,9), move down 3 units and right 1 unit to (1,6). Draw a straight line through these points! The equation of a line can often tell us more than just how to draw it. For example, businesses can use linear equations to project profits or costs over time, and in geometry, they'll help us ensure our structures are level or straight. So next time you sketch a simple line, think about all the real-life scenarios where those equations come into play—like planning a road, designing a bridge, or analyzing trends in data!

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