Math Problem Statement

The graph of a straight line is shown. Find the equation of the line.

Solution

This graph shows a straight line passing through the coordinate plane. To interpret and find the equation of the line, we can extract key points and use them to determine the slope and the y-intercept.

  1. Identify two points on the line:

    • From the graph, we can see two points where the line crosses grid points clearly:
      • The first point is approximately at (0,6)(0, 6) (the y-intercept).
      • The second point is approximately at (2,4)(2, 4).
  2. Calculate the slope (m): The slope is calculated as the change in yy divided by the change in xx: m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1} Using the points (0,6)(0, 6) and (2,4)(2, 4): m=4620=22=1m = \frac{4 - 6}{2 - 0} = \frac{-2}{2} = -1

  3. Find the equation of the line: Using the slope-intercept form y=mx+by = mx + b, where mm is the slope and bb is the y-intercept:

    • The slope m=1m = -1 and the y-intercept b=6b = 6. Thus, the equation of the line is: y=x+6y = -x + 6

Would you like further details or explanations on this? Here are some related questions to deepen your understanding:

  1. How can you calculate the slope of a line if given two arbitrary points?
  2. What is the importance of the y-intercept in the equation of a line?
  3. How can you convert a linear equation from standard form to slope-intercept form?
  4. What is the relationship between the slope of a line and the steepness of its graph?
  5. How can you graph a line given its equation?

Tip: When calculating slope, always pay attention to the signs of the changes in yy and xx to ensure accuracy in direction (positive or negative slope).

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Slope-Intercept Form
Coordinate Geometry

Formulas

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

Theorems

Slope of a line theorem
Intercept theorem

Suitable Grade Level

Grades 8-10