exam Maths Puzzle Numerical Ability

I have to resolve this by graphing the equations in six different ways. Here they are to see if I am doing them right.
4x+3y=>24
3x+4y=>8
x=>0
y=>0

First I need to eliminat

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exam Other Question

Simplify and reduce:
-x+9/x^2-9+2/x+3
I came up with :
x+6/(x-3)(x+3)
Is this correct???
Please help.

Tim kicks a ball off the ground. After t seconds, its height, h (in feet), is given by the formula h = -16t^2 + 64t. What is the maximum height reached by the ball?

Thanks