Question 48
VariationIf y ∝ 1/x2 and y = 1 1/4 when x = 4, find the value of y when x = 1/2.
- A.2 1/2
- B.5
- C.10
- D.80
Show the answer and explanation
Answer: D (80)
Explanation
k = yx2 = 5/4 × 16 = 20. When x = 1/2, y = 20 ÷ 1/4 = 80.
If y ∝ 1/x2 and y = 1 1/4 when x = 4, find the value of y when x = 1/2.
Answer: D (80)
k = yx2 = 5/4 × 16 = 20. When x = 1/2, y = 20 ÷ 1/4 = 80.