tolong bantunin soal mtk 7pangkat x-y = 49dan 7pangkat x+y=343 dalam sistem persamaan

7^x-y = 49
7^x-y = 7^2
x - y = 2

7^x+y = 343
7^x+y = 7^3
x + y = 3

x-y = 2
x+y = 3
----------- -
-2y = -1
y = ½
x-½ = 2
x = 2 ½ = 5/2