Question

Решите систему уравнений способом подстановки

Answer 1

5)$left { {{x + 5y = -2} atop {0.5x - y = 6}} right. \ left { {{x + 5y = -2} atop {0.5x = 6 + y}} right. \ left { {{x + 5y = -2} atop {x = 12 + 2y}} right. \ left { {{12 + 2y + 5y = -2} atop {x = 12 + 2y}} right. \ left { {{7y= -14} atop {x = 12 + 2y}} right. \ left { {{y= -2} atop {x = 12 - 4}} right. \ left { {{y= -2} atop {x = 8}} right.$

6)$left { {{12x - y = 18} atop {x + 0.5y = 5}} right. \ left { {{12x - y = 18} atop { 0.5y = 5 - x}} right. \ left { {{12x - y = 18} atop { y = 10 - 2x}} right. \ left { {{12x - 10 + 2x = 18} atop { y = 10 - 2x}} right. \ left { {{14x = 28} atop { y = 10 - 2x}} right. \ left { {{x = 2} atop { y = 10 - 2x}} right. \ left { {{x = 2} atop { y = 10 - 4}} right. \ left { {{x = 2} atop { y = 6}} right.$
(Лучший ответ)