X+y = 4
x= 4-y
2^(4-y) + 2^y = 10
2^4 / 2^y +2^y =10 замена переменной 2^y = t
16 / t + t = 10 умножаем на t
16 +t^2 =10t
t^2 -10t +16 =0
D = (-10)^2 - 4*1*16 = 36
√D = - /+ 6
t1 = 1/2 (10-6) =2 ; 2^y =2 ; y =1; x =4-y = 4-1=3 (3; 1)
t2 = 1/2 (10+6)=8 ; 2^y =8 =2^3; y = 3; x =4-3=1 (1; 3)
Ответ (1;3) (3;1)