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Use the given conditions to write an equation for the line in point slope form and slope-intercept form. Passing through \( (-4,-1) \) and \( (4,11) \) Type the point-slope form of the equation of the line. (Use integers or simplified fractions for any numbers in the equation.)

Ask by Vaughn Ball. in the United States
Feb 28,2025

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The point-slope form of the equation of the line is \( y + 1 = \frac{3}{2}(x + 4) \).

Solución

First, we find the slope (m) using the two points (-4, -1) and (4, 11):   m = (11 – (–1)) / (4 – (–4)) = 12/8 = 3/2 Using the point-slope form, which is:   y – y₁ = m(x – x₁), and choosing the point (–4, –1), we have:   y – (–1) = (3/2)(x – (–4))   y + 1 = (3/2)(x + 4) This is the point-slope form of the equation of the line. For reference, here’s the slope-intercept form as well: Start with:   y + 1 = (3/2)(x + 4) Distribute the slope:   y + 1 = (3/2)x + 6 Then solve for y by subtracting 1 from both sides:   y = (3/2)x + 6 – 1   y = (3/2)x + 5 Thus, the slope-intercept form is y = (3/2)x + 5. But according to the problem, the point-slope form is:   y + 1 = (3/2)(x + 4)

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To find the equation of the line, we first need to calculate the slope (m) using the two given points \( (-4,-1) \) and \( (4,11) \). The slope formula is: \[ m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{11 - (-1)}{4 - (-4)} = \frac{12}{8} = \frac{3}{2} \] Now, using the point-slope form \( y - y_1 = m(x - x_1) \) with one of the points, say \( (-4, -1) \): \[ y - (-1) = \frac{3}{2}(x - (-4)) \] This simplifies to: \[ y + 1 = \frac{3}{2}(x + 4) \] Now, in slope-intercept form \( y = mx + b \), we can distribute and simplify further: \[ y + 1 = \frac{3}{2}x + 6 \] \[ y = \frac{3}{2}x + 5 \] The point-slope form of the equation is \( y + 1 = \frac{3}{2}(x + 4) \) and the slope-intercept form is \( y = \frac{3}{2}x + 5 \).

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