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Get hints, ask questions, and work through this problem step by step

I'm Plex, here to help with problems on this worksheet!

[Maximum mark: 4]

Solve the system of equations

⎩⎪⎪⎪⎨⎪⎪⎪⎧2x+y−z=3,−x+3y+2z=7,x−2y+4z=1.

Write the system in the form Ax=b and find A−1.
[2]
Hence solve for (x,y,z).
[2]

[Maximum mark: 4]

Solve the system of equations

⎩⎪⎪⎪⎨⎪⎪⎪⎧2x+y−z=3,−x+3y+2z=7,x−2y+4z=1.

Write the system in the form Ax=b and find A−1.
[2]
Hence solve for (x,y,z).
[2]