exam Maths Puzzle Numerical Ability

the soloution of the system of equations below

y=5-3x
4x-5y=13

how do i solve for x and y

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exam Other Question

what are the domains of these expressions? How do I find these domains?

1). the sqrt of 2-x
2). x-3 over x+2
3). 3x^2 +2x -8 How much of a liquid with a 30% alchohol content and how much of a liquid with a 100% alcohol content should be added to end up with 42 milliiters of with a 50% alcohol content?