Question

Help pls!
it's very urgent.​

Answer 1

`\cfrac{81^(x+y)* 27^(x+y)}{3^(7x-y)}\implies \cfrac{(3^4)^(x+y)* (3^3)^(x+y)}{3^(7x-y)}\implies \cfrac{(3)^(4(x+y))* (3)^(3(x+y))}{3^(7x-y)} \\\\\\ \cfrac{3^(4x+4y)* 3^(3x+3y)}{3^(7x-y)}\implies 3^(4x+4y)* 3^(3x+3y)* 3^(-(7x-y)) \\\\\\ 3^(4x+4y)* 3^(3x+3y)* 3^(y-7x)\implies 3^(4x+4y+3x+3y+y-7x) \\\\\\ 3^(8y)\implies (3^8)^y\implies {\Large \begin{array}{llll} 6561^y \end{array}}`