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

1. 5 over 2x plus x over 2

2. 4y2(this is y squared) +16y/4y Please help, I am not sure if what I got for this solution correct. I got a=3 b=0 c=5. It asks to: express irrational solutions in simplest form. If it has no solution, write no solution.
3n^2-75=0
Please help me, Thank You=)