Question

решите систему уравнений x+2y = 3
2х - 2y = 6​

Answer 1

Ответ:

(3;0)

Объяснение:

x+2y = 3

2х - 2y = 6​   сложим оба урав.

3х=9

x=9:3=3

x=3

y=(3-x)/2=0

(3;0)

Answer 2

$\left \{ {{x + 2y = 3} \atop {2x - 2y = 6}} \right. \\ \left \{ {{2y = 3 - x} \atop {2x - 2y = 6}} \right. \\ 2x - (3 - x) = 6 \\ \fbox{x = 3} \\ 2 \times 3 - 2y = 6 \\ \fbox{y = 0} \\ \boldsymbol{(x \: ; \: y) = ( 3\:; \: 0)}$