Question
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a. Rewrite the given equation \( x+3 y-3=0 \) slope-intercept form. b. Give the slope and \( y \)-intercept. c. Use the slope and \( y \)-intercept to graph the linear function.

Ask by Olson Donnelly. in the United States
Feb 27,2025

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Answer

a. The equation in slope-intercept form is \( y = -\frac{1}{3}x + 1 \). b. Slope (m) is –1/3 and y-intercept (b) is 1. c. To graph the function: 1. Plot the y-intercept at (0, 1). 2. Use the slope to find another point: from (0, 1), move 3 units right and 1 unit down to (3, 0). 3. Draw a straight line through these points.

Solution

a. To rewrite the given equation x + 3y – 3 = 0 in slope-intercept form (y = mx + b), solve for y:   x + 3y – 3 = 0   => 3y = –x + 3   => y = (–1/3)x + 1 b. Comparing with y = mx + b, we see that:   Slope (m) = –1/3   y-intercept (b) = 1 (which means the point (0, 1) on the graph) c. To graph the linear function using the slope and y-intercept: 1. Start by plotting the y-intercept (0, 1) on the coordinate plane. 2. The slope is –1/3, which means for every 3 units you move to the right, you move 1 unit down. From (0, 1), move over 3 units to the right to (3, 1) and then down 1 unit to (3, 0). Plot the point (3, 0). 3. Connect these two points with a straight line and extend it in both directions. This line represents the graph of the equation y = –(1/3)x + 1.

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The Deep Dive

To convert the equation \( x + 3y - 3 = 0 \) into slope-intercept form, you need to solve for \( y \). Start by isolating \( y \): 1. Rearrange the equation: \[ 3y = -x + 3 \] 2. Divide by 3: \[ y = -\frac{1}{3}x + 1 \] Now, the equation is in the slope-intercept form \( y = mx + b \), where \( m \) is the slope and \( b \) is the \( y \)-intercept. The slope (\( m \)) of the equation is \(-\frac{1}{3}\), and the \( y \)-intercept (\( b \)) is \( 1\). This means the line crosses the \( y \)-axis at the point \( (0, 1) \) and for every step of 1 unit you move to the right along the \( x \)-axis, you'll move \(\frac{1}{3}\) units down corresponding to the negative slope. To graph the linear function, start at the \( y \)-intercept point \( (0, 1) \). From there, use the slope: for every 3 units you move to the right (along the \( x \)-axis), move 1 unit down (along the \( y \)-axis) to plot the next point. Mark points along this trend and draw a straight line through them, extending it in both directions to represent the full linear relationship. Don't forget to label your axes!

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