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5x+y=3
2x+1=4y
y=3 -5x
2x+1=4(3-5x)
y=3-5x
2x+1=12-20x
y=3-5x
22x=11
y=3-5x
x=1/2
y=3-5*1/2=3-5/2=1/2
5x+y=3
2x-4y=-1
5x+y=3/*4
2x-4y=-1
20x+4y=12
22x=11/:22
x=½
2x-4y=-1
2*½-4y=-1
-4y=-2/:(-4)
y=½