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first you differentiate both equations giving dy/dt = 3 and dx/dt = 4t+3
dividing dy/dt by dx/dt gives dy/dx and so the answer is 3/(4t+3)

As these are simultaneous equations you will need to get a coefficient of either x or y on one side and then substitute it within the other equation. Using the second equation you can divide by 2 leading ...

T=9g/5 ms^-2m=2 kgtime for higest point = 7/2 sec

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