math problem

pewpew SG

The system of equations
2x + y + 7z = 9556
3x + y + 4z = 5899
5x + 2y + z = 3155
can be used to estimate the number of cats, x, rats, y, and lizards, z, on an island used as a nature reserve.
a. Write this system of simultaneous linear equations in matrix form.

⎡                         ⎤⎡         ⎤       ⎡          ⎤
|                            |   |             |         |             |
|                            |   |             |         |             |
|                            |   |             |   =    |             |
|                            |   |             |         |             |
|                            |   |             |         |             |
⎣                         ⎦⎣        ⎦     ⎣          ⎦

need help :(

pewpew SG

!!! Theres two more parts behind.

b. Write down the inverse matrix that can be used to solve this system of simultaneous linear equations.

c. Solve the system of simultaneous linear equations and hence estimate the number of cats, rats and lizards
on the island.

I cant even do a. .......

eagle SG

$\begin{bmatrix} 2&1&7 \\ 3&1&4 \\ 5&2&1 \end{bmatrix}$ $\begin{bmatrix} x\\ y\\ z \end{bmatrix}$ $=\begin{bmatrix} 9556\\ 5889\\ 3155 \end{bmatrix}$

pewpew SG

oh!! okay, i think i know how to do b and c now.

xstryker SG

mai bullshit la pewpew