2x+y=6
x/4-y/5=4 /*20
2x+y=6 /*4
5x-4y=80
8x+4y=24
_________
13x=104 /:13
x=8
2x+y=6 /*5
5x-4y=80 /*(-2)
10x+5y=30
-10x+8y=-160
______________
13y=-130 /:13
y=-10
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2x+y=6
x/4-y/5=4 /*20
2x+y=6 /*4
5x-4y=80
8x+4y=24
5x-4y=80
_________
13x=104 /:13
x=8
2x+y=6 /*5
5x-4y=80 /*(-2)
10x+5y=30
-10x+8y=-160
______________
13y=-130 /:13
y=-10