exam Maths Puzzle Numerical Ability

Solve

1/4x - 1/5y = 2
0.03x - 0.4y = -1.64

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exam Other Question

c/2z + d/3z 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.

|4 1 5 1| 6|
|1 -1 0 -1| 8|
|3 0 0 7| 4|
|0 0 11 5| 3|