Resolva o sistema usando a regra de cramer.3x + y = 9 2x + 3y = 13.... Pergunta de ideia deLarinhaSousa

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May 2020 2 123 Report

Resolva o sistema usando a regra de cramer.
3x + y = 9
2x + 3y = 13

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souacarol 3x + y = 9 .(-2)
2x + 3y = 13 .(3)

-6x - 2y = -18
6x +9y = 39
7y = 21
y = 21 / 7
y = 3

3x + y = 9
3x + 3 = 9
3x = 9 - 3
3x = 6
x = 6 / 3
x = 2

22 votes Thanks 51

Eriivan 3 1 D=3*3-2*1
2 3 D=9-2
D=7

Agora o Dx , lembrando use os termos independentes

9 1 Dx=9*3-1*13
13 3 Dx=27-13
Dx= 14

Agora o Dy

3 9 Dy=3*13-9*2
2 13 Dy=29-18
Dy=21

Agora determinando os valores de x e y

x=Dx/D
x=14/7 x=2

y=Dy/D
y=21/7 y= 3

9 votes Thanks 19