Question

A solução do sistema 2x – y = 3 é :
x + y = 3
a- ( ) (1, 1)
b- ( ) (2, 1)
c- ( ) (1, 2)
d- ( ) (1, 0)

Answer 1

$Ok.. resumindo\\\\\begin{bmatrix}2x-y=3\\ x+y=3\end{bmatrix}\\\\\begin{bmatrix}\frac{3+y}{2}+y=3\end{bmatrix}\\\\\begin{bmatrix}\frac{3+3y}{2}=3\end{bmatrix}\\\\x=\frac{3+1}{2}\\\\x=2\\\\x=2,\:y=1$

LETRA B ( X ) (2, 1)