Math Problem Statement

Find the equation of a line passing through (1, 3) and (7, 2).

Solution

The problem asks to find the equation of a line passing through the points (1,3)(1, 3) and (7,2)(7, 2).

Steps:

  1. Find the slope mm using the slope formula: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Where (x1,y1)=(1,3)(x_1, y_1) = (1, 3) and (x2,y2)=(7,2)(x_2, y_2) = (7, 2).

  2. Apply the point-slope form of the line equation: yy1=m(xx1)y - y_1 = m(x - x_1) Once we find the slope, substitute mm, x1x_1, and y1y_1 to get the equation.

Let's calculate the slope and the final equation of the line.

First, calculate the slope mm: m=2371=16=16m = \frac{2 - 3}{7 - 1} = \frac{-1}{6} = -\frac{1}{6}

Now use the point-slope form: y3=16(x1)y - 3 = -\frac{1}{6}(x - 1)

Simplifying: y3=16x+16y - 3 = -\frac{1}{6}x + \frac{1}{6} y=16x+16+3y = -\frac{1}{6}x + \frac{1}{6} + 3 y=16x+16+186y = -\frac{1}{6}x + \frac{1}{6} + \frac{18}{6} y=16x+196y = -\frac{1}{6}x + \frac{19}{6}

Final Equation:

y=16x+196y = -\frac{1}{6}x + \frac{19}{6}

Would you like any more details or explanations?


Here are five related questions:

  1. How do you derive the slope-intercept form of a line from two points?
  2. What is the slope if the two points were (1,3)(1, 3) and (7,5)(7, 5)?
  3. How can you find the equation of a vertical line through two points?
  4. How do you interpret the slope of a line geometrically?
  5. What is the significance of the yy-intercept in the equation of a line?

Tip: In any two-point problem, always use the slope formula first to avoid calculation mistakes!

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Math Problem Analysis

Mathematical Concepts

Linear Algebra
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

Slope-Intercept Theorem

Suitable Grade Level

Grades 7-9