3.51: Linear law: $e^{2y}$ against $x^{2}$

When $e^{2y}$ is plotted against $x^{2}$, a straight line through $(4, 7.96)$ and $(2, 3.76)$ is obtained. Find $y$ in terms of $x$.

Find $y$ when $x=1$.

Find the positive values of $x$ for which the straight line exists (domain of $y$).