Question

Answer 1

`a {(3x+y=3), (2x-y=7):}`

`<=> {(x=2), (y=-3):}`

`b, {(2x+5y=8),(2x-3y=0):}`

`<=> {(x=3/2), (y=1):}`

`c, {(4x+3y=6),(2x+y=4):}`

`<=> {(x = 3), (y=-2):}`

Answer 2

a: =>5x=10 và 2x-y=7

=>x=2 và y=2x-7=-3

b: \(\Leftrightarrow\left\{{}\begin{matrix}8y=8\\2x=3y\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=1\\x=\dfrac{3}{2}\end{matrix}\right.\)

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