Question 16
VariationIf x varies directly as y3 and x = 2 when y = 1, find x when y = 5.
- A.2
- B.10
- C.125
- D.250.
Show the answer and explanation
Answer: D (250.)
Explanation
x = ky³, and x = 2 at y = 1 gives k = 2. At y = 5, x = 2 × 125 = 250.
If x varies directly as y3 and x = 2 when y = 1, find x when y = 5.
Answer: D (250.)
x = ky³, and x = 2 at y = 1 gives k = 2. At y = 5, x = 2 × 125 = 250.