Urgent-Help within hour pls

y = k / (sqrtx)

y sqrt x = k

4 (sqrt2) = k

1 = 4 sqrt 2  / x

x = 4 sqrt 2

You forgot the sqrt on the bottom EP, just a trivial mistake that SpaceX should have picke  up for himeself.

$y=\frac{k}{\sqrt x}\\ (2,4)\\ 4=\frac{k}{\sqrt 2}\\ k=4\sqrt 2\\ y=\frac{4\sqrt 2}{\sqrt x}\\ when\;y=1\\ 1=\frac{4\sqrt 2}{\sqrt x}\\ 1=\frac{32}{x}\\ x=32$