Question

Im so confused with this question 21≥3(a-7)+9

Answer 1

a ≥11

Explanation:

`21 \geqslant 3a - 21 + 9 \\ 21 \geqslant 3a - 12 \\ 21 + 12 \geqslant 3a - 12 + 12 \\ 33 \geqslant 3a \\ 3a \leqslant 33 \\ a \geqslant 11`

Answer 2

I got you!

a ≤ 11

For more info, look at the steps in the attached image!

Explanation: