Math Problem Statement

Write the equation of the line that passes through the points (-1, 3) and (-9, 5). Put your answer in fully simplified point-slope form, unless it is a vertical or horizontal line.

Solution

To solve the problem from the image, we need to find the equation of a line passing through the points (-1, 3) and (-9, 5). We will express the equation in point-slope form.

Steps:

  1. Find the slope (mm) of the line: The slope formula between two points (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) is: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Substituting the given points (1,3)(-1, 3) and (9,5)(-9, 5): m=539(1)=28=14m = \frac{5 - 3}{-9 - (-1)} = \frac{2}{-8} = -\frac{1}{4}

  2. Write the equation using the point-slope form: The point-slope form of the equation of a line is: yy1=m(xx1)y - y_1 = m(x - x_1) You can use either point for (x1,y1)(x_1, y_1). Let's use the point (1,3)(-1, 3): y3=14(x(1))=14(x+1)y - 3 = -\frac{1}{4}(x - (-1)) = -\frac{1}{4}(x + 1)

Thus, the point-slope form of the line is: y3=14(x+1)y - 3 = -\frac{1}{4}(x + 1)

This is the fully simplified point-slope form of the equation.

Let me know if you'd like further details, or if you have any questions!

5 Related Questions:

  1. How do you convert point-slope form to slope-intercept form?
  2. What does the slope tell you about the direction of the line?
  3. How can you find the distance between two points on a line?
  4. How do you find the midpoint of a line segment between two points?
  5. What is the general form of a line equation, and how is it different from point-slope form?

Tip:

When working with the slope formula, be careful with signs; subtracting negatives can easily lead to mistakes!

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Math Problem Analysis

Mathematical Concepts

Algebra
Coordinate Geometry
Point-Slope Form

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Point-slope form: y - y1 = m(x - x1)

Theorems

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Suitable Grade Level

Grades 8-10