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  • 21-12-2020
  • Mathematics
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Solve the inequality please- 21 ≥ 3(a- 7) +9 Thank you so much

Respuesta :

unicorn3125
unicorn3125 unicorn3125
  • 21-12-2020

Answer:

        a ∈ (-∞, -3>

Step-by-step explanation:

- 21 ≥ 3(a - 7) + 9

- 21 ≥ 3a - 21 + 9

  +21         +21

   0 ≥ 3a + 9

3a + 9 ≤ 0

      -9      -9

3a ≤ - 9

 ÷3    ÷3

 a ≤ -3

a ∈ (-∞, -3>

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