Question 993465
{{{d(e^(xy))=d(4x+4y+20)}}}
{{{e^(xy)(xdy+ydx)=4dx+4dy}}}
{{{xe^(xy)dx-4dx=-ye^(xy)dy+4dy}}}
{{{(-ye^(xy)+4)dy=(xe^(xy)-4)dx}}}
{{{dy/dx=(xe^(xy)-4)/(-ye^(xy)+4)}}}
{{{highlight(dy/dx=-(xe^(xy)-4)/(ye^(xy)-4))}}}