3x+y=13
5x+4y=31
5x+4(13-3x)=31
5x+52-12x=31
52-31=12x-5x
21=7x
x=3
y=13-3x
y=13-3*3
y=13-9
y=4
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3x+y=13
5x+4y=31
5x+4(13-3x)=31
5x+52-12x=31
52-31=12x-5x
21=7x
x=3
y=13-3x
y=13-3*3
y=13-9
y=4
x=3
y=4