Math Problem Statement

Answer this

On a piece of paper, graph y = -2x - 2. Then determine which answer choice matches the graph you drew.

Solution

To solve this problem, let's first analyze the given equation y=2x2y = -2x - 2.

Step 1: Identify the key features of the equation.

This is a linear equation in slope-intercept form y=mx+by = mx + b, where:

  • m=2m = -2 (the slope)
  • b=2b = -2 (the y-intercept)

Step 2: Plot key points.

  1. Y-intercept: The graph crosses the y-axis at (0,2)(0, -2).
  2. Slope: The slope is 2-2, which means for every 1 unit you move to the right along the x-axis, the graph moves 2 units down. From the y-intercept (0,2)(0, -2), if you go 1 unit right, you will move to (1,4)(1, -4).

Step 3: Match the Graphs.

Now, let's look at the four options:

  • Graph A: The line is sloped negatively and passes through (0,2)(0, -2), but the slope does not match 2-2.
  • Graph B: The line passes through (0,2)(0, -2) and has a slope of 2-2, making it the correct graph.
  • Graph C: The slope and intercept do not match.
  • Graph D: The slope is wrong for this graph.

Conclusion:

The correct graph is Graph B.

Would you like more details on this solution, or do you have further questions?

Here are 5 relative questions to expand your understanding:

  1. How do you calculate the slope of a line given two points?
  2. What is the significance of the y-intercept in a linear equation?
  3. How would the graph change if the slope was positive instead of negative?
  4. How do you graph an equation if it’s given in standard form Ax+By=CAx + By = C?
  5. What are the steps to convert from point-slope form to slope-intercept form?

Tip: When graphing linear equations, always start by plotting the y-intercept and then use the slope to find other points.

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Math Problem Analysis

Mathematical Concepts

Algebra
Graphing Linear Equations
Slope-Intercept Form

Formulas

y = mx + b
Slope formula: m = (change in y) / (change in x)

Theorems

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Suitable Grade Level

Grades 7-9