If the wave is propagated in vacuum and covered a distance of 4.3m along the x-axis in 10seconds. Find it displacement along the y-axis.

well, I guess if it zipped through empty space it is an electromagnetic wave with a speed of about

c = 3 * 10^8 m/s

I guess it is two dimensional space since no one is mentioning speed along the z axis

so
Vx = .43 m/s

Vx^2 + Vy^2 = 9 * 10^16

Vy ^2 = 9 * 10^16 - 18*10^-2
LOL
I am just going to say 3 * 10^8 m/s