Question

2x +y =5
x +y =1

respondam por favor​

Answer 1

$\begin{Bmatrix}2x + y = 5 \ \ \mathsf{(I)}\\ x + y = 1 \ \ \mathsf{(II)}\end{matrix}\\\\\\\mathsf{Substituindo\ em\ II\ e\ isolando\ em\ I,}\\\\x = 1 - y\\\\2x + y = 5\\2(1 - y) + y = 5\\2 - 2y + y = 5\\2 - y = 5\\-y = 3\\\boxed{y = -3}\\\\x + y = 1\\x - 3 = 1\\\boxed{x = 4}$

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