1/3x+y+1/3x-y=3/4,1/2(3x+y)-1/2(3x-y)=-1/8 solve
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a- 1/3x+y+1/3x-y=3/4
1/3x+1/3x=3/4
2/3x=3/4
x=3/4*3/2
x=9/8
b- 1/2(3x+y)-1/2(3x+y)= -1/8
3/2x+1/2y-3/2x-1/2y= -1/8
3/2x-3/2x+1/2y-1/2y= -1/8
= -1/8
May this help you
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