Can someone help me with this ?

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?