To solve the equation −3(y + 6) = 21, the first step is to divide both sides by −3 to isolate the term with \( y \).
So the second step, after dividing both sides by −3, would involve simplifying the equation and then performing the next operation to solve for \( y \).
Therefore, the correct response for the second step in solving the equation is:
Subtract 6 from both sides.