1)
x+3=y+2
3x=4+y
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y=x+1
3x=4+x+1
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y=x+1
2x=5
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x=2,5
y=3,5
2)
2(x+y)=5+x
3(x+y)+4(5+y)=-(x+y+1)
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2(x+y)=5+x
3(x+y)=-20-4y-(x+y+1)
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2*(-4)(x+y)=5*(-4)+x*(-4)
3(x+y)=-20-4y-(x+y+1)
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-8(x+y)=-20-4x
3(x+y)=-20-4y-(x+y)-1
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-8(x+y)=-20-4x
4(x+y)=-20-4y-1
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-4(x+y)=-41-4(x+y)
система решения не имеет !!!