Question

Please help me get the answer

Answer 1

a ≤ -9

Explanation:

`-3a+1\geq28\qquad\text{subtract 1 from both sides}\\\\-3a+1-1\geq28-1\\\\-3a\geq27\qquad\text{change the signs}\\\\3a\leq-27\qquad\text{divide both sides by 3}\\\\a\leq-9`

Answer 2

You need to isolate a.

First subtract 1 from both sides:

-3a > 27

Then divide both sides by -3. Since you are dividing by a negative number the sign > should change to <.

The answer is a < -9

(There should be a line under the sign <.)