Question

3х+3у=18 х-3у=-6 решите систему уравнений пожалуйста

Answer 1

{3x+3у=18
{х-3у=-6
----------------
4x=12
x=3
3-3y=-6
3y=3+6
3y=9
y=3

ответ (3;3)

Answer 2

3y = 18 - 3x
x - (18 - 3x) = -6


3y = 18 - 3x
x - 18 + 3x = -6


3y = 18 - 3x
4x = 12


3y = 18 - 3*3
x = 3

3y = 9
x = 3

y = 3
x = 3

Answer 3

(3;3)