Question

Write a matrix to represent the system of equations.

x - 7y + 2z = -3
8x - 9y + 4z = 6
8y - z = -1

I have 12 boxes to fill in.

Answer 1

do it just like the other one
This one is a 3x3 matrix of the coeffiicients, with a column (x y z) vector
The last row has a zero in the x column

Answer 2

i dont understand

Answer 3

Oh, come on!
x - 7y + 2z = -3
8x - 9y + 4z = 6
8y - z = -1
(1 -7 2)(x) = (-3)
(8 -9 4)(y) = (6)
(0 8 -1)(z) = (-1)

you need to do some reading on the topic.