book Maths Puzzle Numerical Ability

3x+y=14
2x-y=6

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book Other Question

if you were to use Gauss-Jordan elimination on the following linear system, what would the augmented matrix be?
3w-x=2y+z-4
9x-y+z=10
4w+3y-z=7
12x+17=2y-z+6
Where ym is the time in sec needed to win for men, with x the Olympic year and x=0 corresponding to 1900. Find the year in which ym = 42.458