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tung211188
2 năm trước
Giúp em khoanh câu hỏ và giải thích ạ Khi m $\neq$ ±1 thì hệ phương trình $\left \{ {{x+my=m+1} \atop {mx+y}=3m-1} \right.$ có nghiệm duy nhất ($x_{0}$; $y_{0}$). Khi đó, điểm M(x $x_{0}$; $y_{0}$) luôn thuộc đường thẳng có phương trình dạng y=ax+b. Giá trị biểu thức T=$5a^{2}$+ $b^{2}$-1 là: A,9 B,7 C,10 D,8
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