Answer: z ≥ 3; plot a closed dot at "3" going to the right. Don't forget to add the arrow to signal that it goes forever.
Step-by-step explanation:
To solve -2z+9≤ 5z - 12:
-2z+9≤ 5z - 12
Subtract 9 from both sides of the equation:
-2z ≤ 5z - 21
Subtract 5z from both sides of the equation:
-7z ≤ -21
Divide both sides of the equation by -7:
z ≥ 3; the sign flips since we are dividing by a negative.
