Phase difference

How to find the phase difference of two waves if they look like they are in phase but they have different displacement?

Yup I meant they have different amplitude but I thought they had different displacement as well.
What's the difference between amplitude and displacement? I know displacement can be either positive or negative depending on the graph whereas amplitude can not be negative.

Amplitude is the maximum displacement from equilibrium.

The two waves are in phase so the phase difference is zero, the amplitude doesnt affect phase difference, it only effects the ‘resultant wave’. There is also another solution which is valid for this question but ill let u figure that one out.

If anything was unclear feel free to quite me and ask a question. Also a friendly tip, always post a picture where u can, it helps immensely.

The two waves have different amplitudes but we can't say they have different displacements.

I dont really like this wording. Other than that it was all fine.

They have different amplitudes, amplitude is maximum displacement, so there maximum displacements are different.

I think the axis on your graph are slightly confusing. The position axis is essentially a time axis, as u can see the waves have the same time period.

As both waves start at equilibrium at the same ‘time’ and have the same wavelength, they will be in phase and they will constructively interfere with each other.

Right, so if the position axis is a time axis, the phase difference in wavelength is genuinely the "time lag" of two waves(?), which makes more sense to me.
So as the superposition is the vector sum of the displacement of the two waves (and as they are in phase they will constructively interfere with each other, as you said) the superposition should look like supercrest supertrough and supercrest. (?)

Yep where u have a crest now, u will have a supercrest when they interfere, same goes for troughs

I get it now
Thank you so so much x