Объяснение:
Координаты точки пересечения можно найти методом вычитания:
а) 
чтобы найти переменную 
, достаточно вычесть от верхней части системы нижнюю, тогда получится 
, найдем координату 
, подставим значение х в любую часть системы: 
, следовательно точка пересечения этих прямых будет находится по координатам 
б) 
, искомый ответ будет 
в) 
тут возникает противоречие, если прямые вычесть, то мы не сможем найти или , или же будет 
, что не является верным, значит прямые не будут пересекаться, они являются параллельными
г) 
тут уже можно сразу найти 
, искомый ответ будет 
ответ: а), б), в)Нет решения, г)
Примечание: Если в г была система такая 
, то это это две прямые, которые совпадают и ответом будет бесконечное множество.
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