10x+4y=5
x-y=17/20
x=17/20+y
10(17/20+y)+4y=5
8,5+10y+4y=5
14y=-3.5
y=-0.25
x+0.25=0.85
x=0.6
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10x+4y=5
x-y=17/20
10x+4y=5
x=17/20+y
10(17/20+y)+4y=5
8,5+10y+4y=5
14y=-3.5
y=-0.25
x+0.25=0.85
x=0.6