Math Problem Statement

Which graph represents the solution set for the inequality y < 4x - 2?

Solution

The inequality given is:

y<4x2y < 4x - 2

To graph this inequality, we first look at the related linear equation:

y=4x2y = 4x - 2

  1. Find the y-intercept: The y-intercept is at y=2y = -2, so the point (0,2)(0, -2) is on the line.
  2. Find the slope: The slope is 4, which means for every 1 unit moved to the right (along the x-axis), we move up 4 units (along the y-axis). From the point (0,2)(0, -2), we can plot a second point by moving right 1 unit and up 4 units to reach the point (1,2)(1, 2).

Now, since the inequality is y<4x2y < 4x - 2, the line is dashed (because the inequality does not include the equal sign). The shading is below the line, as yy values are less than the right-hand side of the equation.

Let's match this with the provided graphs:

  • The first graph shows a shaded area above the line, which is incorrect for this inequality.
  • The second graph shows a dashed line and shading below the line, which matches the inequality y<4x2y < 4x - 2.
  • The third graph shows shading above the line, which is also incorrect.

So, the second graph correctly represents the solution set for the inequality y<4x2y < 4x - 2.

Would you like further explanation or more practice on inequalities? Here are some related questions:

  1. How would the graph change if the inequality was y4x2y \leq 4x - 2?
  2. How can you determine if a point is in the solution set of the inequality?
  3. What is the difference between "strict" and "non-strict" inequalities in terms of graphing?
  4. How would you graph the inequality y2x+3y \geq 2x + 3?
  5. Can you explain how to find the shading region for inequalities with a negative slope?

Tip: Always remember that dashed lines are used for strict inequalities (like << or >>), and solid lines are used for non-strict inequalities (like \leq or \geq).

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Math Problem Analysis

Mathematical Concepts

Linear Inequalities
Graphing Linear Inequalities

Formulas

y = 4x - 2

Theorems

Graphing linear inequalities
Shading regions for inequalities

Suitable Grade Level

Grades 8-10