book Maths Puzzle Numerical Ability

linear equation. Does this have a solution? If not why? If so why?
24x + 10y = 4000
5y = -12x + 8000

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What are the 3 different formulas to finding the area of a triangle? I also need the name to the corresponding formulas. Thankyou find the values of f(x) = x squared-1 and g(x)=1-2x, when f(g(1)) and g(f(1))