x and y vary inversely such that x = 10 when y = 6. Find the value of y when x = 15.

10 4 7 8

4

The correct answer is Option (2) → 4 Since x and y vary inversely Therefore, x ∝ \(\frac{1}{y}\) i.e. xy = Constant x1 y1 = x2 y2 10 × 6 = 15 × y2 Answer: y2 = 4