Ответ: \[- 4x - 7y = 5,6:\] \[- 4x = 5,6 + 7y\] \[x = - \frac{7}{4}y - 1,4;\] \[- 7y = 5,6 + 4x\] \[y = - \frac{4}{7}x - 0,8.\]