exam Maths Puzzle Numerical Ability

Hi,

Can someone please help me with this math problem I have been trying over and over again to try to figure it out but I don't have a clue. If you can will you show me how you

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exam Other Question

write the system of linear equations represented by the augmented matrix. Use x,y,z and if necessary w,x,y,z for the variables.

|7 0 4 |-13|
|0 1 -5 |11 |
|2 7 0 |6 | What would a x value, that is undefined, be for the equation y=2/(1-2x)?