4x/y-15y/x=17
(x/y)=a
4a-15/a=17
4a²-17a-15=0
D=289+240=529
a1=(17-23)/8=-3/4
a2=(17+23)/8=5
1)x/y=-3/4⇒x=-3y/4
-27y³/64+y³/8=-19
-27y³+8y³=-19*64
-19y³=-19*64
y³=64
y=4
x=-3*4/4=-3
2)x/y=5⇒x=5y
125y³+y³/8=-19
1000y³+y³=-162
1001y³=-162
y³=-162/1001
y=-3√6006/1001
x=-15√6006/1001