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5x+y=13
7x-4y=2
y=13-5x
7x-4(13-5x)=2
7x-52+20x=2
27x=54
x=2
y=13-5*2
y=13-10
y=3
5x+y=13 / - 5x
7x-4y=2
y=13-5x
7x-4(13-5x) = 2
y=13-5x
7x-52+20x=2
y=13-5x
27x=54 / : 27
y=13-5x
x=2
y=13-5x
x=2
y=13-5*2
x=2
y=13-10
x=2
y=3