k(BC)=(3-1)/(-6-2)=-1/4
k(AH)=4
AH:y-2=4(x+3)
y=4x+14.(1)
k(CH)=-1/3
k(AB)=-1/k(CH)=3
AB:y-1=3(x-2)
y=3x-5.(2)
解方程组(1),(2),得
4x+14=3x-5
x=-19,y=-62
点A的坐标(-19,-62)