Question

Which calculation can be used to find the value of y in the equation y3 = 27?

Answer 1

You would have to factor using difference of cubes and set each factor equal to 0. 

Answer 2

if you mean 3y = 27 where 3y means implied multiplication between 3 and y, then just divide both sides of the equation by 3 and find that y=9

if y3 means y raised to the exponent of 3 as in $y^{3} = 27$, then you would need to take the cube root of both sides of the equation to find y = 3