exam Maths Puzzle Numerical Ability

Solve the system by the elimination method.
5x + 2y = -7
7x - 3y = 19
What is the solution to the system???
I really do not understand these how to do these? Can someone please help??

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exam Other Question

Use interval notation to state the domain of the function f(x)=sqrt(x+2)/x-3 4. thank you all so much for your invaluable help. I would like to SEE how I can FACTOR this problem, please help. Thank you!

5u^3 - 80uy^2