exam Maths Puzzle Numerical Ability

Solve the system using an augmented matrix. Show your work.

5x + 4y -z = 1
2x -2y +z = 1
-x -y +z =2

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exam Other Question

6x+3y=5
y=-2x+1
Can someone please help me solve this linear system in three variables?

x-3y=11
5y+z=4
-x+z=2
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