Question

please solve it
$4 {}^{x} = 7 {}^{y} \: then x + y \div xy$
solve it​

Answer 1

Step-by-step explanation:

(4x+7y):(5x−y) is the duplicate ratio of 5:1.

Also, the duplicate ratio of 5:1 is 25:1.

∴ 5x−y 4x+7y

=125⇒4x+7y=125x−25y

∴125x−4x=7y+25y

∴ yx

= 121 32∴x:y=32:121