Question

Решите систему уравнений 30 балов

Answer 1

$left { {{x=9+v} atop {x-2v+1=3}} right.$

$left { {{x=9+v} atop {(9+v)-2v=3-1}} right$

$left { {{x=9+v} atop {9+v-2v=2}} right$

$left { {{x=9+v} atop {9-v=2}} right$

$left { {{x=9+v} atop {-v=2-9}} right$

$left { {{x=9+v} atop {-v=-7}} right$

$left { {{x=9+v} atop {v=7}} right$

$left { {{x=9+7} atop {v=7}} right$

$left { {{x=16} atop {v=7}} right$

Answer 2

х = 9 + v
x - 2v + 1 = 3
x = 2v + 2
9 + v = 2v + 2
v = 7
x = 9 + 7
x = 16
Ответ
x = 16
v = 7