McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
2. Solving Quadratic Equations by Graphing
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Exercise 43 Page 109

Each point that lies inside the shaded region is a solution of the quadratic inequality.

Sometimes

Practice makes perfect

Let's analyze the given graph of a quadratic inequality.

Each point that lies inside the shaded region is a solution of the quadratic inequality.

We want to determine whether the y-value of a solution of the inequality is sometimes, always, or never greater than 2. First, let's draw the line y=2.

We can take note of the following observations.

  • If a point lies above the line y=2, its y-coordinate is greater than 2.
  • If a point lies below the line y=2, its y-coordinate is less than 2.
  • If a point on the line y=2, its y-coordinate is equal 2.

We can find points that lie inside the shaded region, and have different position with respect to the line y=2.

Therefore, sometimes the y-value of a solution is greater than 2.