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 .
Step 1: Identify the key features of the equation.
This is a linear equation in slope-intercept form , where:
- (the slope)
- (the y-intercept)
Step 2: Plot key points.
- Y-intercept: The graph crosses the y-axis at .
- Slope: The slope is , 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 , if you go 1 unit right, you will move to .
Step 3: Match the Graphs.
Now, let's look at the four options:
- Graph A: The line is sloped negatively and passes through , but the slope does not match .
- Graph B: The line passes through and has a slope of , 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:
- How do you calculate the slope of a line given two points?
- What is the significance of the y-intercept in a linear equation?
- How would the graph change if the slope was positive instead of negative?
- How do you graph an equation if it’s given in standard form ?
- 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
-
Suitable Grade Level
Grades 7-9