3^x+y = 64 x-y = 1 berapa nilai x yang memejuhi pers. tsb? *lambang ^ dibaca pangkat

jawab

(3)^(x + y) = 64

x - y = 1
y = x - 1

(3)^(x +x  -1) = 64
(3)(2x - 1) = 64

3^(2x) . 3^(-1) = 64
1/3. (9)^x = 64
(9)^x = 192
x= ⁹log 192