Can somebody me out with this problem? you don't need to tell me the answer just me work it out .

Hey!

So first, you need to isolate the y variable:

sqrt 2y = 9   ==>  subtract 3 from both sides. 

Now, raise both sides of the equation to the power of 2 to eliminate the square root:

2y = 81

Solve for y by dividing both sides by 2.

Hope this helps :)

It would be 18 cm