Math Problem Statement

Find the equation of the line that passes through the points (1, 4) and (-3,-2).

Solution

To find the equation of the line passing through the points (1,4)(1, 4) and (3,2)(-3, -2), we can use the point-slope form of the equation of a line:

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

Where:

  • (x1,y1)(x_1, y_1) is a point on the line.
  • mm is the slope of the line.

Step 1: Find the slope

The formula for the slope mm 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}

Substitute the coordinates of the points (1,4)(1, 4) and (3,2)(-3, -2):

m=2431=64=32m = \frac{-2 - 4}{-3 - 1} = \frac{-6}{-4} = \frac{3}{2}

Step 2: Use the point-slope form

Now that we have the slope m=32m = \frac{3}{2}, we can use one of the points (let's use (1,4)(1, 4)) in the point-slope form equation:

y4=32(x1)y - 4 = \frac{3}{2}(x - 1)

Step 3: Simplify to slope-intercept form

Now, simplify the equation to get the slope-intercept form y=mx+by = mx + b:

y4=32(x1)y - 4 = \frac{3}{2}(x - 1) y4=32x32y - 4 = \frac{3}{2}x - \frac{3}{2} y=32x32+4y = \frac{3}{2}x - \frac{3}{2} + 4 y=32x+52y = \frac{3}{2}x + \frac{5}{2}

Thus, the equation of the line in slope-intercept form is:

y=32x+52y = \frac{3}{2}x + \frac{5}{2}

Would you like further details or have any questions?


Here are five related questions:

  1. How do you convert a linear equation from point-slope form to standard form?
  2. How would the equation change if one point was at the origin?
  3. Can you find the equation of a line parallel to this one passing through a different point?
  4. How would you find the equation of a line perpendicular to this one?
  5. What is the interpretation of the slope 32\frac{3}{2} in real-world terms?

Tip: Always verify your slope calculation to avoid errors in the final equation.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

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

Slope theorem
Point-slope theorem

Suitable Grade Level

Grades 8-10