book Maths Puzzle Numerical Ability

If the ordered pair (3,a) is the solution to the system 3x-4y=1
5x+2y=19 find a.

Graph the system: y=2x-7

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book Other Question

How do I multiply and write the result in simplest form of 2 over 9 . 4 over 5? Here is the problem.
John invested a total of $4800 in two business ventures. One investment returned 15% and the other returned 9% after one year. If the dollar amount of the ret