Question

Nilai x dan y dari 1/2x - y= -7 dan 1/3 x + 1/2y =0 adalah.... Tolong ya gannnnn...

Answer 1

1/2x - y = -7 (× 1/2)
1/3x + 1/2y = 0
-----------------------
1/4x - 1/2y = -7
1/3x + 1/2y = 0
--------------------- +
7/12x = -7
x = -7 : 7/12
x = -7 × 12/7
x = - 84/7
x = -12

1/2x - y = -7
1/2(-12) - y = -7
-12/2 - y = -7
-6 -y = - 7
-y = -7 + 6
-y = -1
y= 1

jadi nilai x= -12
y = 1