2x-y-10=0
y=2x-10
x^2/20-y^2/5=1
x^2-4y^2=20
x^2-4(2x-10)^2=20
-15x^2+160x-400=20
x=6,14/3
y=2,-2/3
直线和双曲线的交点坐标:(6,2),(14/3,-2/3)