Algebra equation into Excel

I am trying to make an equation in Excel. I want to figure out what a dollar amount is before adding the tax. The end total is a rounded number. So if the tax is 9.25% and I want to price the item at $18 (after adding the tax).

So the algebra equation is going to be:

X * .0925 = Y

Y + X = 18

I get Y = 1.5240 and X = 16.476

How do I get Excel to calculate X and Y for me after inputting .0925 and 18?

Thanks

Jason