Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 116 стр.

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            y 2 − y1                                                                                     ∗
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                     x 3∗    −     x 2∗          α11 ( x 3 − x 2 ) + α12 ( y 3 − y 2 )   α11 ( x 3 − x 2 ) + α12 ( y 3 − y 2 )
                 
                 

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