Question

Solve for x and y.

Answer 1

$4^{x+y}=64\Rightarrow x+y=3$
$2^{2x-y}=128\Rightarrow 2x-y=7$

So we have
$x+y=3$
$2x-y=7$
Solve for $x$:
$3x=10$
$\Rightarrow x=\frac{10}{3}$

Plug $x$ into one of the equations:
$\frac{10}{3}+y=3$
$\Rightarrow y=-\frac{1}{3}$

So the answer is
$x=\frac{10}{3}, y=-\frac{1}{3}$

Answer 2

4^10/3 + -1/3 will equal to 64
2^(2*10/3-1/3) will equal to 128

Your final answer is A. x = 10/3, y = -1/3