Final answer:
To solve the equation 3(y - 1 + 2y), distribute the 3 to each term inside the parentheses, combine like terms, resulting in 9y - 3.
Step-by-step explanation:
To solve the equation 3(y - 1 + 2y), we need to distribute the 3 to each term inside the parentheses:
3 × y = 3y
3 × -1 = -3
3 × 2y = 6y
So the equation becomes 3y - 3 + 6y. Combining like terms, we get 9y - 3. Therefore, the correct equivalent expression is 9y - 3 (Option C).