Okay I thought I was getting better at but I keep seeming to get some questions wrong!! My math teacher never seems to have time to explain either!!! Could someone pretty please tell me where I'm going wrong?? Is there something I'm not understanding please?

Write an equation for x that does not involve p if:

1.) a = ym/p and 2.) m = pz^2

So I thought rearrange equation 2 to make p the subject and then substitute into equation 1 but I got the question wrong???

rearranging 2 gives p = m/z^2

substituting into equation 1

a = ym/mz^2

simplifying

a = y/z^2 but I was told this was wrong help??

Combine a = bcd and e = ct to give an equation for d that does not involve c

I thought

rearrange a = bcd to make d the subject

d = a/bc

rearrange e = ct to make c the subject

c = e/t

so

d = a / b(e/t) right??

Help please cause I'm confused and a bit frustrated that I keep getting questions like this wrong lol