Final answer:
The least value of y for which the inequality (3 - 6y) < -15 is true is y = 4.
Step-by-step explanation:
To find the least value of y for which the inequality (3 - 6y) < -15 is true, we need to solve the inequality for y.
First, we subtract 3 from both sides of the inequality: -6y < -18.
Then, we divide both sides of the inequality by -6, remembering to reverse the inequality sign when dividing by a negative number. This gives us y > 3.
Therefore, the least value of y for which the inequality is true is y = 4.