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a) 2x + y = -1
reemplazamos para ver si cumple con la igualdad
2(-3) + (5) = -1
-6 +5 = -1
-1 = -1
⇒ si cumple
b) x + 2y = 4
(-3) +2(5) = 4
7 = 4
⇒ no cumple
c) x - 3y = 5
( -3) - 3(5) =5
-18 =5
⇒ no cumple
∴ la respuesta es la a)