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Part 1 of 2 Write an equation in point-slope form of the line that passes through the given points, then write the equation in slope-intercept form. \( (-9,7),(9,1) \) What is the point-slope form of the equation of the line? \( \square \) (Simplify your answer. Use integers or fractions for any numbers in the equation.)

Ask by Knight Willis. in the United States
Mar 11,2025

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Answer

The point-slope form of the equation is: \[ y - 7 = -\frac{1}{3}(x + 9) \]

Solution

1. Calculate the slope \( m \) of the line using the two points: \[ m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{1 - 7}{9 - (-9)} = \frac{-6}{18} = -\frac{1}{3} \] 2. Using the point-slope form with point \( (-9, 7) \): \[ y - 7 = -\frac{1}{3}(x - (-9)) = -\frac{1}{3}(x + 9) \] The point-slope form of the equation is: \[ y - 7 = -\frac{1}{3}(x + 9) \]

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Beyond the Answer

To find the point-slope form of the line that passes through the points \( (-9, 7) \) and \( (9, 1) \), we first need to calculate the slope, \( m \). The slope \( m \) is given by the formula: \[ m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{1 - 7}{9 - (-9)} = \frac{-6}{18} = -\frac{1}{3} \] Now that we have the slope, we can use the point-slope form of the equation, which is \( y - y_1 = m(x - x_1) \). We can use either of the two points; let’s use \( (-9, 7) \): \[ y - 7 = -\frac{1}{3}(x + 9) \] This is the point-slope form of the equation. To convert it to slope-intercept form, we distribute and simplify: \[ y - 7 = -\frac{1}{3}x - 3 \implies y = -\frac{1}{3}x + 4 \] So the equation in slope-intercept form is: 1. Point-slope form: \( y - 7 = -\frac{1}{3}(x + 9) \) 2. Slope-intercept form: \( y = -\frac{1}{3}x + 4 \)

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