x-3y=5/+3y
y+3x=-5
x=5+3y
y+3(5+3y)=-5
y+15+9y=-5/-15
10y=-20/÷10
y=-2
x=5+3*2=5+6=11
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x-3y=5/+3y
y+3x=-5
x=5+3y
y+3(5+3y)=-5
x=5+3y
y+15+9y=-5/-15
x=5+3y
10y=-20/÷10
y=-2
x=5+3*2=5+6=11