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Math Help - [SOLVED] Is this problem a related rate or first derivative(velocity).

  1. #1
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    [SOLVED] Is this problem a related rate or first derivative(velocity).

    At time t a particle moving along the x-axis is at position x. The relationship between x and t is given by: tx = x^2 +10. At x=2 what is the velocity of the particle.
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  2. #2
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    on differentiating,

    x+t*dx/dt=2x

    or,dx/dt=x/t=2/t.

    now,put,x=2 in original equation,u get,t=7.

    so,dx/dt(x=2)=2/7 units.
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  3. #3
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    is sbcd90 correct?
    I still don't understand.
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