I'll solve by my way, maybe more complicated but.... 1) 2X = a 3Y = b 3^a = 5184 a = 7,78558 X = 3,89279 2^b = 5184 ...... Y = 4,1133 X*Y = 16 X + Y = 8 Result , 2 Bingo (The values of A and B can be found using logarithms or even by calculating them on your cell phone calculator, very simple. I found them via logarithms, but I usually calculate them on my cell phone.)