Systems of linear inequalities solutions

Determine if each ordered pair is a solution of the system of linear inequalities.
#1 y<2x+2 & y≥-3x+4
(1,4) (2,2) (1,1) (0,4) (4,5)

1 answer

To determine if each ordered pair is a solution to the system of inequalities \( y < 2x + 2 \) and \( y \geq -3x + 4 \), we will substitute each ordered pair into both inequalities and check if they satisfy both conditions.

Inequalities:

  1. \( y < 2x + 2 \)
  2. \( y \geq -3x + 4 \)

Check each ordered pair:

  1. For (1, 4):

    • Substitute \( x = 1 \) and \( y = 4 \):
      • Check 1: \( 4 < 2(1) + 2 \) → \( 4 < 4 \) (False)
      • Check 2: \( 4 \geq -3(1) + 4 \) → \( 4 \geq 1 \) (True)
    • Result: Not a solution (fails first inequality)
  2. For (2, 2):

    • Substitute \( x = 2 \) and \( y = 2 \):
      • Check 1: \( 2 < 2(2) + 2 \) → \( 2 < 6 \) (True)
      • Check 2: \( 2 \geq -3(2) + 4 \) → \( 2 \geq -2 \) (True)
    • Result: It is a solution (satisfies both inequalities)
  3. For (1, 1):

    • Substitute \( x = 1 \) and \( y = 1 \):
      • Check 1: \( 1 < 2(1) + 2 \) → \( 1 < 4 \) (True)
      • Check 2: \( 1 \geq -3(1) + 4 \) → \( 1 \geq 1 \) (True)
    • Result: It is a solution (satisfies both inequalities)
  4. For (0, 4):

    • Substitute \( x = 0 \) and \( y = 4 \):
      • Check 1: \( 4 < 2(0) + 2 \) → \( 4 < 2 \) (False)
      • Check 2: \( 4 \geq -3(0) + 4 \) → \( 4 \geq 4 \) (True)
    • Result: Not a solution (fails first inequality)
  5. For (4, 5):

    • Substitute \( x = 4 \) and \( y = 5 \):
      • Check 1: \( 5 < 2(4) + 2 \) → \( 5 < 10 \) (True)
      • Check 2: \( 5 \geq -3(4) + 4 \) → \( 5 \geq -8 \) (True)
    • Result: It is a solution (satisfies both inequalities)

Summary of Results:

  • (1, 4): Not a solution
  • (2, 2): Solution
  • (1, 1): Solution
  • (0, 4): Not a solution
  • (4, 5): Solution