exam Maths Puzzle Numerical Ability

I am trying to solve this equation for y:
2y + 4x = 8

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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 | 4x-4y-z=38
What does x =?