Math Problem Statement

What is a point-slope equation for the line that goes through (2, -1) and (3, 5)?

Solution

To find the point-slope form of the equation for the line passing through the points (2,1)(2, -1) and (3,5)(3, 5), we'll follow these steps:

  1. Find the slope (mm): m=y2y1x2x1=5(1)32=61=6m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{5 - (-1)}{3 - 2} = \frac{6}{1} = 6

  2. Use the point-slope form equation: yy1=m(xx1)y - y_1 = m(x - x_1) Substitute one of the points (either (2,1)(2, -1) or (3,5)(3, 5)) and the slope m=6m = 6 into the equation.

    Using the point (2,1)(2, -1): y(1)=6(x2)y - (-1) = 6(x - 2) Simplifying this: y+1=6(x2)y + 1 = 6(x - 2)

This matches the first option in your provided choices:

  • y+1=6(x2)\boxed{y + 1 = 6(x - 2)}

Would you like more details on any part of this solution, or do you have any other questions?


Here are five related questions:

  1. How do you convert from point-slope form to slope-intercept form?
  2. What is the equation of the line in standard form that passes through the points (2,1)(2, -1) and (3,5)(3, 5)?
  3. How would the equation change if the line had a negative slope?
  4. How do you find the equation of a line given only the slope and y-intercept?
  5. What would be the equation if the points were swapped, i.e., (3,5)(3, 5) to (2,1)(2, -1)?

Tip: The point-slope form is particularly useful for finding the equation of a line quickly when you know one point on the line and the slope.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Point-Slope Form

Formulas

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

Theorems

Slope Theorem

Suitable Grade Level

Grades 8-10