Answer:
y = c/z²
Step-by-step explanation:
(1) y ∝ 1/x²or
y = a/x² where a is a constant
x ∝ z or x = bz, where b is a constant
Substitute x into (1)
y ∝ a/(bz)² = a/(b²z²) = (a/b²)/z²
a is a constant and b is a constant, so a/b² is a constant.
Let c = a/b². Then
y = c/z²
