Math Problem Statement

Tell whether the ordered pair (-4,2) is a solution of the system of linear inequalities: 1. y < -4x 2. y ≥ x - 4

Solution

To determine if the ordered pair (4,2)(-4, 2) is a solution to the system of linear inequalities:

  1. y<4xy < -4x
  2. yx4y \geq x - 4

we substitute x=4x = -4 and y=2y = 2 into each inequality and check if both are true.

Step 1: Check the first inequality y<4xy < -4x

Substitute x=4x = -4 and y=2y = 2 into y<4xy < -4x:

2<4(4)2 < -4(-4) 2<162 < 16

This is true, so the ordered pair (4,2)(-4, 2) satisfies the first inequality.

Step 2: Check the second inequality yx4y \geq x - 4

Substitute x=4x = -4 and y=2y = 2 into yx4y \geq x - 4:

2442 \geq -4 - 4 282 \geq -8

This is also true, so the ordered pair (4,2)(-4, 2) satisfies the second inequality as well.

Conclusion

Since (4,2)(-4, 2) satisfies both inequalities, it is a solution to the system of linear inequalities.

Would you like more details, or do you have any questions?


Here are some related questions for further practice:

  1. How would you determine if a different point is a solution to this system?
  2. What would happen if one of the inequalities used \leq or >> instead?
  3. Can you graph these inequalities to visually confirm the solution?
  4. How do we know when a system of inequalities has no solutions?
  5. How would you test multiple points in one system of inequalities?

Tip: Always substitute each inequality separately to ensure accuracy when verifying solutions.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Inequalities
Systems of Inequalities

Formulas

Substitute x and y values into inequalities to check validity

Theorems

Properties of inequalities

Suitable Grade Level

Grades 7-9