 Hello and welcome to the session. Let us understand the following question today. If x and y are connected parametrically by the equations given below without eliminating the parameter find dy by dx, we have x is equal to 40 and y is equal to 4 divided by t. Now let us write the solution. Given to us is x is equal to 40 and y is equal to 4 by t. Therefore dx by dt is equal to 4 and dy by dt is equal to minus 4 by t square. Now by chain rule dy by dx is equal to dy by dt multiplied by dt by dx which is equal to dy by dt is equal to minus 4 by t square multiplied by dx by dt is 4 so dt by dx is equal to 1 by 4. Now we see here this 4 and 4 gets cancels so it is equal to minus 1 by t square. Therefore dy by dx is equal to minus 1 by t square hence minus 1 by t square is our required answer. I hope you understood the question. Bye and have a nice day.