exam Maths Puzzle Numerical Ability

Find the slope and the y-intercept.
y = 4x - 3

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exam Other Question

Hello I am being asked a question that I do not understand, It asks to Solve a system of equations to find the two numbers described.
The sum of two numbers is 17 and their difference is 29 Simplify and reduce:
-x+9/x^2-9+2/x+3
I came up with :
x+6/(x-3)(x+3)
Is this correct???