Jambmaths question:
y varies directly as w2 . When y = 8, w = 2. Find y when x = 3
Option A:
12
Option B:
9
Option C:
6
Option D:
18
Jamb Maths Solution:
$\begin{align} & y\propto {{w}^{2}} \\ & y=kw\text{ (}k\text{ is the constant of proportionality)} \\ & 8=k({{2}^{2}}) \\ & k=2 \\ & \text{when }w=3 \\ & y=2{{(3)}^{2}}=18 \\\end{align}$
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