\[\boxed{\mathbf{813\ (813).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[y = kx - 3;\ \ y = x^{2}\]
\[kx - 3 = x^{2};\ \ x = - 2\]
\[- 2k - 3 = ( - 2)^{2}\]
\[- 2k - 3 = 4\]
\[- 2k = 7\]
\[k = - 3,5\]
\[Ответ:\ k = - 3,5.\]