x-3y = 1 /* -1
x+2y=16
-x+3y=-1
-----------
5y=15
y=3
x-3*3=1
x=10
x=1+3y
1+3y+2y=16
5y=15 /:5
x=1+3y=1+3*3=10
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x-3y = 1 /* -1
x+2y=16
-x+3y=-1
x+2y=16
-----------
5y=15
y=3
x-3*3=1
x=10
x=10
y=3
x=1+3y
1+3y+2y=16
5y=15 /:5
y=3
x=1+3y=1+3*3=10