Question

{2a+b=3
{4a-3b=1
từng bước nha

Answer 1

\(\left\{{}\begin{matrix}2.2a+2b=3.2\\4a-3b=1\end{matrix}\right.=>\left\{{}\begin{matrix}4a+2b=6\\4a-3b=1\end{matrix}\right.=>\left\{{}\begin{matrix}2a-\left(-3a\right)=6-1\\2a+b=3\end{matrix}\right.=>\left\{{}\begin{matrix}5a=5\\2a+b=3\end{matrix}\right.=>\left\{{}\begin{matrix}a=1\\2.1+b=3\end{matrix}\right.=>\left\{{}\begin{matrix}a=1\\b=1\end{matrix}\right.\)

Answer 2

Áp dụng pp cộng đại số:

`{(2a+b=3),(4a-3b=1):}`

`<=>{(6a+3b=9),(4a-3b=1):}`

`<=>{(10a=10),(2a+b=3):}`

`<=>{(a=1),(2.1+b=3):}`

`<=>{(a=1),(b=1):}`