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

(1/4-1/x^2)/(1/2+1/x) can someone help me simplify this complex fraction? Hi i'd really appreciate it if someone could help me with this word problem.
A full tank contains 729 litres of pure acid. First m litres of acid was poured out and the tank was f