3х-у=-5 -5х+2у=1
3x+5=y
-5x+2y=1
-5x+2*(3x+5)=1
-5x+6x+10=1
-y+10=1
-y=1-10
-y=-9
y=9
3x-9=-5
3x=-5+9
3x=4|/3
x=4/3
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3*4/3-9=-5
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3х-у=-5
-5х+2у=1
3x+5=y
-5x+2y=1
-5x+2*(3x+5)=1
-5x+6x+10=1
-y+10=1
-y=1-10
-y=-9
y=9
3x-9=-5
3x=-5+9
3x=4|/3
x=4/3
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3*4/3-9=-5