Question

Answer 1

Bài 1: 

a: \(\Leftrightarrow\left\{{}\begin{matrix}5x=10\\2x+y=7\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\\y=3\end{matrix}\right.\)

b: \(\Leftrightarrow\left\{{}\begin{matrix}4x+3y=6\\4x+2y=8\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=-2\\2x=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=3\\y=-2\end{matrix}\right.\)

Answer 2

a/ 

<=> 5x = 10

=> x = 2 

thay x vào 3.x - y = 3

=> y = 3

b/ <=> 6x +4y = 10

2 ( 3x + 2y ) = 10

=> 3x + 2y = 5

=> x= 3  . y = -2