Find dy/dx : (9/x)+(9/y)=4 My answer is ((xy)^2 - 9y^2)/-9x^2 My answer is not matching with the correct answer. Is it wrong ? Can u help me.
Follow Math Help Forum on Facebook and Google+
Originally Posted by kashifzaidi Find dy/dx : (9/x)+(9/y)=4 My answer is ((xy)^2 - 9y^2)/-9x^2 My answer is not matching with the correct answer. Is it wrong ? Can u help me. $\displaystyle \frac{9}{x}+\frac{9}{y}=4$ $\displaystyle -\frac{9}{x^2}-\frac{9}{y^2}y'=0$ $\displaystyle y'=-\frac{y^2}{x^2}$
View Tag Cloud