1- Aplicando o método mais conveniente para o caso, resolva os seguintes sistemas:

A) {x-3y=9
2x+3y=6}



B) {2x+3y=0
3x+5y=2}



C) {5x+4y=1
2x-3y=5}



D) {x-y=1
x-3y=-3}
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