Question

Please see the photo

Answer 1

Given,

$\bold{x=y=2b}$

Given equation,

$\bold{\frac{x}{a}+\frac{y}{b}=1}$

Applying the value of y(= 2b) to the equation,

$\implies\bold{\frac{x}{a}+\frac{2b}{b}=1}$

$\implies\bold{\frac{x}{a}+2=1}$

$\implies\bold{\frac{x}{a}=1-2}$

$\implies\bold{\frac{x}{a}=-1}$

Given, x = 3

$\implies\bold{\frac{3}{a}=-1}$

$\implies\bold{a=\frac{3}{-1}}$

$\implies\bold{a=-3}$

$\boxed{\bold{\therefore a=-3}}$