Triangle $$\(H J K\)$$ is isosceles with $$\(H J=H K\)$$ and $$\(J K=\sqrt{80}\)$$ $$\(H\)$$ is the point with coordinates $$\((-4,1)\)$$ $$\(J\)$$ is the point with coordinates $$\((j, 15)\)$$ where $$\(j< 0\)$$ $$\(K\)$$ is the point with coordinates $$\((6, k)\)$$ $$\(M\)$$ is the midpoint of $$\(J K\)$$. The gradient of $$\(H M\)$$ is 2 Find the value of $$\(j\)$$ and the value of $$\(k\)$$.

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