Question

alguém me ajuda prfff​

Answer 1

3)

2x = 4

x = 2

3y = -9

y = -3

2z = 6

z = 3

z + t = 1

3 + t = 1

t = -2

4)

a) 10x + 2y = 140

     4x - 2y = 0

14x = 140

x = 10

4(10) - 2y = 0

40 - 2y = 0

y = 20

b)

$\left[\begin{array}{cccc}1&2&-3&1\\3&-1&2&0\\2&1&1&2\end{array}\right] =\left[\begin{array}{ccc}-7&11&-3\\-3&7&0\\\end{array}\right]-> -16z=-9$

z = 9/16

x + 2y = 43/16

3x - y = -18/16

-------

x + 2y = 43/16

6x - 2y = -36/16

7x = 7/16

x = 7/7(16) = 1/16

3(1/16) - y =  -18/16

-y = -21/16

y = 21/16