x+y=2a+7⑴
x-2y=4a-3⑵
⑴×2+⑵得:3x=8a+11,x=(8a+11)/3
⑴-⑵得:3y=-2a+10,y=(-2a+10)/3
∵x>y>0
(8a+11)/3>(-2a+10)/3>0
8a+11>-2a+10>0
10a>0
a>0
x+y=2a+7⑴
x-2y=4a-3⑵
⑴×2+⑵得:3x=8a+11,x=(8a+11)/3
⑴-⑵得:3y=-2a+10,y=(-2a+10)/3
∵x>y>0
(8a+11)/3>(-2a+10)/3>0
8a+11>-2a+10>0
10a>0
a>0