Question

solve the simultaneous equation​

Answer 1

Explanation:

given xy=640

$2 log_{10}(x) - log_{10}(y) = 2$

$log_{10}( {x}^{2} ) - log_{10}(y) = 2$

$log_{10}( \frac{ {x}^{2} }{y} ) = 2$

$\frac{ {x}^{2} }{y} = 100$

$x = 10 \sqrt{y}$

$\frac{640}{y} = 10 \sqrt{y}$

${y}^{ \frac{3}{2} } = 64$

$y = {64}^{ \frac{2}{3} }$

$y = 16$

$xy = 640 \\ x \times 16 = 640 \\ x = 40$

Answer 2

see in attachment.

Mark as Brainlist answer.