Math Problem Statement

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Austin graphed a linear equation on the coordinate plane. Which equations best represent the graph? Select TWO correct answers.

Solution

To determine which equations best represent the graph, we need to analyze the line on the coordinate plane. Let's go through the key points to understand the slope and y-intercept of this line.

Step 1: Identifying the Slope

From the graph:

  • The line passes through points (0,3)(0, -3) and (2,3)(2, 3).
  • Using these points, we can calculate the slope (mm) as follows:

m=y2y1x2x1=3(3)20=62=3m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{3 - (-3)}{2 - 0} = \frac{6}{2} = 3

Step 2: Identifying the Y-Intercept

The y-intercept occurs when x=0x = 0. Looking at the graph, we see that the line crosses the y-axis at 3-3. Thus, the y-intercept bb is 3-3.

Step 3: Writing the Equation

With a slope of 33 and a y-intercept of 3-3, the equation of the line in slope-intercept form (y=mx+by = mx + b) is:

y=3x3y = 3x - 3

Step 4: Selecting the Correct Equations

We now look for equations equivalent to y=3x3y = 3x - 3 among the options:

  • Option A: y3=3(x2)y - 3 = 3(x - 2)

    • Expanding: y3=3x6y - 3 = 3x - 6
    • y=3x3y = 3x - 3 (This matches our equation.)
  • Option D: y=3x3y = 3x - 3

    • This is exactly the equation we derived.

Thus, the correct answers are:

A and D

Would you like a detailed explanation of any step, or do you have further questions?


Here are five related questions for further exploration:

  1. How can we find the equation of a line given two points?
  2. What is the significance of slope in linear equations?
  3. How do transformations affect the equation of a line?
  4. How can we convert between different forms of a line equation?
  5. What are the characteristics of parallel lines on a graph?

Tip: When given a graph, always check the slope and y-intercept to find the line’s equation.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Coordinate Geometry
Slope-Intercept Form
Point-Slope Form

Formulas

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

Theorems

Slope-Intercept Theorem
Point-Slope Theorem

Suitable Grade Level

Grade 8