tentukan akar akar dari sistem persamaan berikut!

jawab

misal 1/x = a
1/y = b

a + b = 5........kali 3
3a+ 2b = 12

3a + 3b = 15
3a + 2b = 12......(-)
b = 3

a + b = 5
a + 3 = 5
a = 2

a = 2 --> x=  1/a = 1/2
b = 3 --> y = 1/b = 1/3