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x^-1 +3y^-1 =-1/2 I x4 I = 4x^-1 + 12y^-1 =-2 .....ii
pers 1 dan 2 dikurangi
-6y^-1 = 6
y^-1 =6/-6
y^-1 =-1
1/y= -1
y =-1
,masukkan ke pers ii
x^-1 +3y^-1 = -1/2
x^-1 + 3(-1) = -1/2
x^-1 -3 =-1/2
x^-1 = 5/2
1/x=5/2
x=2/5
maka 5x +2y = 5(2/5) + 2(-1) = 2+(-2) = 0