exam Maths Puzzle Numerical Ability

solve the system using matrices. Use Gaussian elimination iwth back-substitution or Gauss-Jordan elimination:

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

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exam Other Question

Graph using the intercept method: x + 3y = 6.
Requires a graph! Can someone help me with this problem? Thanks

Graph the following equations and find:

The y-intercept.
The x-intercepts, if any.
The vertex.
The line of symmetry.