Math Problem Statement

A line passes through the points (-2, -5) and (1, 4). Find the equation of the line. Write your final answer in slope-intercept form.

Solution

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"A line passes through the points (-2, -5) and (1, 4). Find the equation of the line. Write your final answer in slope-intercept form."

Solution:

  1. Find the slope (m) using the slope formula: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Using the given points (-2, -5) and (1, 4): m=4(5)1(2)=4+51+2=93=3m = \frac{4 - (-5)}{1 - (-2)} = \frac{4 + 5}{1 + 2} = \frac{9}{3} = 3

  2. Use the point-slope form of a line equation: The formula is: yy1=m(xx1)y - y_1 = m(x - x_1) Choose one point, say (-2, -5), and substitute m=3m = 3: y(5)=3(x(2))y - (-5) = 3(x - (-2)) Simplify: y+5=3(x+2)y + 5 = 3(x + 2)

  3. Expand and simplify into slope-intercept form: y+5=3x+6y + 5 = 3x + 6 Subtract 5 from both sides: y=3x+1y = 3x + 1

Final Answer:

The equation of the line is: y=3x+1y = 3x + 1


Would you like a deeper explanation or visualization? Here are five related questions for practice:

  1. How do you find the equation of a line if you're given one point and the slope?
  2. What happens to the slope if two points have the same x-coordinate?
  3. How would you convert a line equation from point-slope form to standard form?
  4. How do you verify that a given point lies on a line?
  5. What does the y-intercept represent in the slope-intercept equation?

Tip: Always double-check your slope calculation to avoid errors in the equation.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Slope-Intercept Form
Point-Slope Form
Slope

Formulas

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

Theorems

Slope of a line
Point-Slope Theorem

Suitable Grade Level

Grades 7-9