Inverse square relation:
y = k/x²
k = x²y
All the entries should give the same k,
k = 1²(4) = 4, k=2²(1)=4, k=3²(4/9)=4, k=4²(1/4)=4
OK, k=4
a) Answer: y = 4/x²
b)
25=4/x²
x² = 4/25
x = ±2/5
Answer: 2/5
