exam Maths Puzzle Numerical Ability

solve this system of equations. if it is unsolvable say so.
3x + 4y + 5z=8
1x - 2y + 3z= -6
2x - 4y + 6z=8

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exam Other Question

determine whether each relation is a function give the domain and range for each relation...
1. {(2,7)(3,7)(5,7)}
2. {(1,10)(2,500)(13,pie)}
3. {(12,13)(14,15)(12,19)} When John F. Kennedy was Sworn in as President, he was 1 year older than Teddy Roosevelt was when Roosevelt took the office. If the sum of their when each became President was 85, how wold was Kennedy when he was sworn in?