Q. 7

y \, \alpha \, x^2 y = 2 when x = 4 y = kx^2 2 = k(4^2) k = \frac{2}{16} = \frac{1}{8} \Rightarrow y = \frac{1}{8} x^2

Find y when x = 10

y = \frac{1}{8} x^2 y = \frac{1}{8} 10^2 y = \frac{100}{8} y = 12.5