1/x + 4/y =4 dan 2/x + 4/y =8

1/x + 4/y = 4
2/x + 4/y = 4
misal 1/x = a dan 1/y = b
a + 4b = 4
2a + 4b = 4......(kurangi)
a = 0

substitusi a ke pers a+4b =4
a + 4b = 4
0 + 4b = 4
4b =4
b = 4/4 = 1
maaf kalo salah.