To solve the equation \(-3(y + 6) = 21\), the first step would typically be to simplify the equation, which often involves dividing both sides by -3 to isolate the term involving \(y\).
So, the second step, once you have divided both sides by -3 to get \(y + 6 = -7\), would then be to subtract 6 from both sides.
Therefore, the correct response for the second step in solving the equation would be:
Subtract 6 from both sides.