Math Problem Statement

Which is the graph of the line y - 2 = 3(x - 1)?

Solution

The problem asks which of the provided graphs represents the equation y2=3(x1)y - 2 = 3(x - 1), which is in point-slope form.

  1. Rewrite the equation into slope-intercept form: y2=3(x1)y - 2 = 3(x - 1) Distribute the 3: y2=3x3y - 2 = 3x - 3 Add 2 to both sides to isolate yy: y=3x1y = 3x - 1 So the equation in slope-intercept form is y=3x1y = 3x - 1, where the slope (m) is 3 and the y-intercept is -1.

  2. Identify the key characteristics:

    • Slope: The line has a slope of 3, meaning it rises 3 units for every 1 unit it moves to the right.
    • Y-intercept: The line crosses the y-axis at y=1y = -1.
  3. Now check the graphs:

    • Graph A: This line does not pass through y=1y = -1.
    • Graph B: This line has a slope of 3 and passes through the y-axis at y=1y = -1. This is a good candidate.
    • Graph C: This line does not have the correct slope.
    • Graph D: This line has the correct slope but crosses the y-axis at y=1y = 1, which is incorrect.

Thus, Graph B is the correct graph.

Would you like further details or have any questions?

Here are five follow-up questions you might consider:

  1. How do you convert a point-slope form equation to slope-intercept form?
  2. How can you determine the slope of a line from a graph?
  3. What is the general form of the point-slope equation?
  4. How can you find the y-intercept of a line from its equation?
  5. How would the graph change if the slope was negative?

Tip: When graphing a line, always start by identifying the slope and the y-intercept for easier plotting!

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Point-Slope Form
Slope-Intercept Form

Formulas

y - y1 = m(x - x1)
y = mx + b

Theorems

Slope-Intercept Form

Suitable Grade Level

Grades 8-10