Matrix

[chadsobey]

Here's the problem:
-4x-2y+4z=-22
-3y+z=-17
5x-3y-z=-8

Here is what I got:
-4, -2, 4=-22
0, -3, 1=-17
5, -3,-1=-8

Am I heading in the right direction?
Next, I need to get the inverse of A and multiply it by B.
Is there a way I can do that without a calculator, if I can't find one online?

2nd problem (This one is a bit more confusing to me):
z=-y-1
-x-y+5z=-27
y=-x+7

Here is what I got:
0, -1, -1=1
-1,-1, 5=-27
-1, -1, 0=-7

 

[Deleted member 4993]

Here's the problem:
-4x-2y+4z=-22
-3y+z=-17
5x-3y-z=-8

Here is what I got:
-4, -2, 4=-22
0, -3, 1=-17
5, -3, -1=-8
Am I heading in the right direction? <<<<< Yes

Next step - divide the top row by (-4)

 1, 0.5, -1  =   5.5
 0,  -3,  1  =  -17
 5,  -3, -1  =  -8

You only need paer & pencil to do this problem



Next, I need to get the inverse of A and multiply it by B.
Is there a way I can do that without a calculator, if I can't find one online?

2nd problem (This one is a bit more confusing to me):
z=-y-1
-x-y+5z=-27
y=-x+7

Here is what I got:
0, -1, -1=1
-1,-1, 5=-27
-1, -1, 0=-7