tentukan penyelesaian atau akar darisistem persamaan x³/3 + y³/2 = 13 dan x³/3 - y³/2 =5

jawab

misal x³ = a , dan y³ = b

a/3 + b/2 = 13  → 2a + 3b = 78
a/3 - b/2 =  5 → 2a - 3b = 30.......||(+)
4a = 108
a = 27

2a + 3b = 78
2(27) + 3b  = 78
3b = 78-54 = 24
b = 8

x³ = a = 27= 3³  →  x = 3
y³ = b = 8 = 2³  → y = 2