Question

Решите систему уравнений:
x-y=3
2x+3y=16

Answer 1

$left { {{x-y=3, |cdot 3} atop {2x+3y=16}} right. oplus left { {{x-y=3} atop {5x=25}} right. ; left { {{5-y=3} atop {x=5}} right. ; left { {{y=2} atop {x=5}} right. ; ; ; ; ; (5,2)$

Answer 2

x-y=3
2x+3y=16

y=x-3
Метод подстановки:
2x+3x-9=16
5x=25
x=5->y=2
(5;2)