Math Problem Statement

Determine the equation of a line passing through the points (-3, 5) and (2, -1).

Solution

The problem asks for the equation of a line passing through the points (3,5)(-3, 5) and (2,1)(2, -1).

To find the equation of the line, we can use the point-slope form or the slope-intercept form of the equation of a line. We'll start by calculating the slope mm using the formula:

m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1}

Where:

  • (x1,y1)=(3,5)(x_1, y_1) = (-3, 5)
  • (x2,y2)=(2,1)(x_2, y_2) = (2, -1)

m=152(3)=62+3=65m = \frac{-1 - 5}{2 - (-3)} = \frac{-6}{2 + 3} = \frac{-6}{5}

So, the slope m=65m = -\frac{6}{5}.

Now, using the point-slope form of the equation of a line:

yy1=m(xx1)y - y_1 = m(x - x_1)

Substituting m=65m = -\frac{6}{5}, and using the point (3,5)(-3, 5):

y5=65(x+3)y - 5 = -\frac{6}{5}(x + 3)

Now, simplifying the equation:

y5=65x185y - 5 = -\frac{6}{5}x - \frac{18}{5}

Add 5 to both sides (convert 5 to 255\frac{25}{5}):

y=65x185+255y = -\frac{6}{5}x - \frac{18}{5} + \frac{25}{5}

y=65x+75y = -\frac{6}{5}x + \frac{7}{5}

Thus, the equation of the line is:

y=65x+75y = -\frac{6}{5}x + \frac{7}{5}

Let me know if you would like more details or explanations!

Here are 5 related questions:

  1. How do you calculate the slope between two points in general?
  2. What is the point-slope form of the equation of a line?
  3. How can you convert point-slope form to slope-intercept form?
  4. How can you verify that a point lies on a given line?
  5. What is the general formula for the equation of a line in standard form?

Tip: You can always use either of the two given points to find the equation once you have the slope, as the result will be the same!

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Coordinate Geometry

Formulas

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

Theorems

Equation of a Line Theorem
Slope Formula

Suitable Grade Level

Grades 8-10