Question

{2x + y =5
{2x-y =11

Answer 1

метод сложения.
4x = 16
x = 4

y = - 3

Answer 2

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Answer 3

а у найти?

Answer 4

y = 5 - 2x
2x - (5-2x) = 11
4x-5 = 11
4x=16
x = 4
y = 5 - 2*4 = -3