exam Maths Puzzle Numerical Ability

1. 5 over 2x plus x over 2

2. 4y2(this is y squared) +16y/4y

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exam Other Question

I am struggling with determing slope based on coordinates. Can you explain how this is done? the soloution of the system of equations below

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

how do i solve for x and y