For the system $ax - by = ab = bx - ay$ (Example 7), the value of $xy$ is —

Question

Accepted Answer

$-\dfrac{a^2 b^2}{(a + b)^2}$

Answer

$\dfrac{a^2 b^2}{(a + b)^2}$

Answer

$\dfrac{ab}{(a + b)^2}$

Answer

$0$

For the system ax−by=ab=bx−ayax - by = ab = bx - ayax−by=ab=bx−ay (Example 7), the value of xyxyxy is —