Math Problem Statement

Which point would not be a solution to the system of linear inequalities y < 2x + 2 and y ≤ -5/2x - 5?

Solution

To determine which point would not be a solution to the given system of inequalities, we need to test each point against both inequalities:

  1. y<2x+2y < 2x + 2
  2. y52x5y \leq -\frac{5}{2}x - 5

Testing Each Point

Let's evaluate each point:

1. Point (4,8)(-4, -8)

  • For y<2x+2y < 2x + 2: 8<2(4)+2=8+2=6(False)-8 < 2(-4) + 2 = -8 + 2 = -6 \quad \text{(False)}
  • Since this fails the first inequality, this point is not a solution.

Checking the Other Points for Completeness

Although (4,8)(-4, -8) already fails the conditions, we can quickly verify the others for understanding:

2. Point (2,4)(-2, -4)

  • For y<2x+2y < 2x + 2: 4<2(2)+2=4+2=2(True)-4 < 2(-2) + 2 = -4 + 2 = -2 \quad \text{(True)}
  • For y52x5y \leq -\frac{5}{2}x - 5: 452(2)5=55=0(True)-4 \leq -\frac{5}{2}(-2) - 5 = 5 - 5 = 0 \quad \text{(True)}

3. Point (8,1)(-8, -1)

  • For y<2x+2y < 2x + 2: 1<2(8)+2=16+2=14(False)-1 < 2(-8) + 2 = -16 + 2 = -14 \quad \text{(False)}
  • This also fails the first inequality.

4. Point (2,8)(-2, -8)

  • For y<2x+2y < 2x + 2: 8<2(2)+2=4+2=2(True)-8 < 2(-2) + 2 = -4 + 2 = -2 \quad \text{(True)}
  • For y52x5y \leq -\frac{5}{2}x - 5: 852(2)5=55=0(True)-8 \leq -\frac{5}{2}(-2) - 5 = 5 - 5 = 0 \quad \text{(True)}

Conclusion

The points (4,8)(-4, -8) and (8,1)(-8, -1) both fail to satisfy at least one inequality. Based on the first failed check, the answer is:

  • (4,8)(-4, -8)

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Inequalities
Coordinate Geometry

Formulas

y < 2x + 2
y ≤ -5/2x - 5

Theorems

Substitution in Inequalities

Suitable Grade Level

Grades 9-10