Question

Resolva os determinantes abaixo pela regra de Cramer.

Answer 1

Vamos là.

1) Resolva os sistemas pela regra de Cramer.

a)

D = 2*(-2) - 2*3 = -10

Dx = 7*(-2) - 2*3 = -20

Dy = 2*2 - 2*7 = -10

x = Dx/D = -20/-10 = 2

y = Dy/D = -10/-10 = 1

b)

D = 3*1 + 2*1 = 5

Dx = 0 + 10 = 10

Dy = 15

x = Dx/D = 10/5 = 2

y = Dy/D = 15/5 = 3

c)

D = -1 - 2 = -3

Dx = -7 - 2 = -9

Dy = 2 - 14 = -12

x = Dx/D = -9/-3 = 3

y = Dy/D = -12/-3 = 4

d)

D = 15 - 2 = 13

Dx = -20 - 6 = -26

Dy = 18 + 8 = 26

x = Dx/D = -26/13 = -2

y = Dy/D = 26/13 = 2