Question

2 - Resolva os sistemas escalonados:

a) x + 2y = 12

3y = 4



x + y + z = 6

b) Y + z = 2

Z = 1



X + 3y – 2z = 0

c) Y + 4z = 0

14z = 0

2x + 5y = 9

d) -x +7y = 5​

Answer 1

Resposta:

a) 3y=4

y=4/3

x+2.4/3=12

x+8=12.3=36

x=36-8=28

28+4/3+z= 6

32+z=6/3

z=2-32

z=-30

b)

z=1

y+1=2

y=2-1=1

x+3.1-2.1=0

x+3-2=0

x+1=0

x=-1

c)

14z=0

z=0/14=0

y+4.0=0

y=0

2x+5.0=9

2x=9

x=9/2=4,5