Question

Mate kelas 9 mohon bantuannya

Answer 1

1/x-1 = a
1/y = b
2a + 3b = 3
5a + 3b = 6
----------------- -
-3a = -3
a = 1
2(1) + 3b = 3
2 + 3b = 3
3b = 1
b = 1/3

1/x-1 = a = 1 ; 1/y = b = 1/3
x-1 = 1 ; y = 3 = yo
x = 2 = xo
xo - yo = 2-3 = -1
Jawabannya : A. (-1)