Math Problem Statement

Write an equation for a line passing through the points (5,1) and (-1,3)

Solution

To find the equation of the line passing through the points (5,1)(5, 1) and (1,3)(-1, 3), we will use the same steps as before.

1. Calculate the Slope mm:

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}

Substituting the points (5,1)(5, 1) and (1,3)(-1, 3):

m=3115=26=13m = \frac{3 - 1}{-1 - 5} = \frac{2}{-6} = -\frac{1}{3}

2. Write the Equation Using the Point-Slope Form:

Now, we'll use the point-slope form of the equation:

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

Using the slope m=13m = -\frac{1}{3} and one of the points, say (5,1)(5, 1):

y1=13(x5)y - 1 = -\frac{1}{3}(x - 5)

3. Convert to Slope-Intercept Form:

Now, expand and simplify to express the equation in slope-intercept form y=mx+by = mx + b:

y1=13x+53y - 1 = -\frac{1}{3}x + \frac{5}{3}

Add 1 to both sides:

y=13x+53+1y = -\frac{1}{3}x + \frac{5}{3} + 1

Convert 1 to a fraction with a denominator of 3:

y=13x+53+33y = -\frac{1}{3}x + \frac{5}{3} + \frac{3}{3}

Simplify:

y=13x+83y = -\frac{1}{3}x + \frac{8}{3}

So, the equation of the line is:

y=13x+83y = -\frac{1}{3}x + \frac{8}{3}

Would you like any more details or have any questions?

Here are 5 related questions:

  1. How would you find the y-intercept from a given line equation?
  2. How can you find the equation of a line perpendicular to this one?
  3. What is the distance between the points (5,1)(5, 1) and (1,3)(-1, 3)?
  4. Can you write the equation of this line in standard form Ax+By=CAx + By = C?
  5. How do you determine if a point lies on a given line?

Tip: When converting to slope-intercept form, simplify fractions carefully to ensure accuracy.

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Math Problem Analysis

Mathematical Concepts

Geometry
Linear Equations

Formulas

Slope formula
Point-slope form
Slope-intercept form

Theorems

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Suitable Grade Level

Grades 7-9