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- 1 -y = x
- 2x + y = 2
- x - y = 1
- 3x = 3
x = -1
c) 4x + 5y = 0
-11 - 7y = -3x
4x + 5y = 0
3x - 7y = 11
7x - 2y = 11
7(3) - 2(5) = 11
La pregunta b no logro entender, si lo pudieras redactar mejor creo que si