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x+y=3
tambahkan 2x=5, x=2,5 y= 0,5
7^x-y = 7^2
x-y = 2
================
7^x+y = 343
7^x+y = 7^3
x+y = 3
================
Sistem persamaan 2 variable:
1) x-y = 2................(1)
2) x+y = 3................(2)
Metode substitusi:
x-y = 2
x = 2 + y.................(3)
Substitusikan persamaan 3 ke persamaan 2:
x+y = 3
(2 + y) + y = 3
2y = 3 - 2
y = 1/2....................(4)
Substitusikan persamaan 4 ke persamaan 1(yg mana saja):
x-y = 2
x-(1/2) = 2
x = 2 + (1/2)
x = 5/2
Jadi, jawabannya ===> x = 5/2
y = 1/2