Question

Resolver por determinantes

AYUDENME!!!!!!!​

Answer 1

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1)

$A = \binom{3}{2} \binom{5}{ - 1}$

$A1 = \binom{7}{ - 4} \binom{5}{ - 1}$

$A2 = \binom{3}{2} \binom{7}{ - 4}$

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$det(A) =3 \times ( - 1) - 5 \times 2 \\ det(A) = - 13$

$det(A1) = 7 \times ( - 1) - ( - 4) \times 5 \\ det(A1) = 13$

$det(A2) = 3 \times ( - 4) - 2 \times 7 \\ det(A2) = - 12 - 14 \\ det(A2) = - 26$

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$x = \frac{det(A1)}{det(A)} \\ x = \frac{13}{ - 13} \\ x = - 1$

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$y = \frac{det(A2)}{det(A)} \\ y = \frac{ - 26}{ - 13} \\ y = 2$

2)

$det(A) = - 15 - 24 \\ det(A) = - 39$

$det(A1) = - 60 + 138 \\ det(A1) = 78$

$det(A2) = - 195$

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$x = - 2$

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$y = 5$