Question

СРОЧНО РЕШИТЕ ПОЖАЛУЙСТА

Answer 1

1. $\left \{ {{x + 3y = 4} \atop {x + y = 6}} \right. => \left \{ {{x = 4 - 3y} \atop {4 - 3y + y = 6}} \right. => \left \{ {{x = 4 - 3y} \atop {4 - 2y = 6}} \right. => \left \{ {{x = 4 - 3y} \atop {2y = -2}} \right. => \left \{ {{x = 4 + 3} \atop {y = -1}} \right. => \left \{ {{y=-1} \atop {x=7}} \right.$

т.е. прямые на коор.прямой пересекаются в точке (7; -1)

2.

3 - 2(11+6x) = 23

3 - 22 + 12 x = 23

12x - 19 = 23

12x = 42

x = 2