Respuesta:
Listo, corroborado con calculadora
Explicación paso a paso:
[tex]3x +5 y = 7 \\ - 2x + 7y = 2 \\ m = \binom{3 \: \: \: 5}{ - 2 \: \: \: 7} = (3 \times 7) - ( - 2 \times 5) = 21 + 10 = 31 \\ mx = \binom{7 \: \: \: 5}{2 \: \: \: 7} = (7 \times 7) - (2 \times 5) = 49 - 10 = 39 \\ my = \binom{3 \: \: \: 7}{ - 2 \: \: \: 2} = (3 \times 2) - ( - 2 \times 7) = 6 + 14 = 20 \\ y = \frac{my}{m} = \frac{20}{31} = 0.64516 \\ x = \frac{mx}{m} = \frac{39}{31} = 1.25806[/tex]
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Respuesta:
Listo, corroborado con calculadora
Explicación paso a paso:
[tex]3x +5 y = 7 \\ - 2x + 7y = 2 \\ m = \binom{3 \: \: \: 5}{ - 2 \: \: \: 7} = (3 \times 7) - ( - 2 \times 5) = 21 + 10 = 31 \\ mx = \binom{7 \: \: \: 5}{2 \: \: \: 7} = (7 \times 7) - (2 \times 5) = 49 - 10 = 39 \\ my = \binom{3 \: \: \: 7}{ - 2 \: \: \: 2} = (3 \times 2) - ( - 2 \times 7) = 6 + 14 = 20 \\ y = \frac{my}{m} = \frac{20}{31} = 0.64516 \\ x = \frac{mx}{m} = \frac{39}{31} = 1.25806[/tex]