reaolva o sistemas a seguir
a) 2x+y=5 b)x= -2y
3x-y=5 x= -3y=17,5

c) 2x+5y=14 d)2x=3y
x=y y=2x+4

POR FAVOR ME AJUDEM!!!!(valendo 100 pts e melhor resposta)​
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