EXERCICIOS 3) Aplicando o método da ADIÇÃO, resolva os segui...

EXERCICIOS 3) Aplicando o método da ADIÇÃO, resolva os seguintes sistemas- a) $\left\{\begin{array}{l}x-y=3 \\ 2 x+y=9\end{array}\right.$ b) $\left\{\begin{array}{l}x=3 y \\ x+2 y=10\end{array}\right.$ c) $\left\{\begin{array}{l}x+y=10 \\ 2 x-y=8\end{array}\right.$ d) $\left\{\begin{array}{l}x=2 y \\ 3 x+5 y=55\end{array}\right.$ e) $\left\{\begin{array}{l}4 x+y=7 \\ 2 x-5 y=9\end{array}\right.$ 辛 $\left\{\begin{array}{l}x+y=8 \\ 4 x-6 y=12\end{array}\right.$ g) $\left\{\begin{array}{l}x-3 y=9 \\ 2 x+3 y=6\end{array}\right.$ h) $\left\{\begin{array}{l}2 x+3 y=0 \\ 3 x+5 y=2\end{array}\right.$ i) $\left\{\begin{array}{l}5 x+4 y=1 \\ 2 x-3 y=5\end{array}\right.$ j) $\left\{\begin{array}{l}x-y=1 \\ x-3 y=-3\end{array}\right.$