Please help me on this SAT question

xthrillakillax
Wed, 30 May 2012 23:16:19 +0000

You could also do it algebraically.
4(2^x) = 2^y
(2^2)(2^x) = 2^y
2^(x+2) = 2^y
Same base, therefore:
x+2 = y
x = y-2