Jawapan

2016-10-02T15:05:42+08:00
X+y=2-------------1
x-y=4--------------2
x=2-y--------------3
gantikan x ke dlm 2
2-y-y=4
2-2y=4
   -2y=4-2
        =2
y= -1
gantikan y ke dlm 1
x+(-1)=2
x-1=2
x=2+1
  =3
∴x=3
  y=-1

but dlm skema jawapan 8&4...btw thanks for your kindness
sorry....jap ye sye cb balik