已知X,Y满足2X-Y=8 ,当2

2X-Y=8
Y=2x-8
因为2≤X≤3
4≤2X≤6
-4≤Y≤-2
-5≤Y-1≤-3
-8≤X-10≤-7
3/8≤(Y-1)/(X-10)≤5/7