Question

x is constant y z when y=2 and z=3,x=30. a.find the relationship between x,y and z. b.find x when y=9 and z=2

Answer 1

Poor wording, guessing that you are saying:
x = k(yz)
given: when y = 2, z = 3, and x = 30
30 = k(2*3)
k = 5
so x = 5yz

when y = 9, z = 2, then
x = 5(9*2) = 90