Decide whether the triangles are similar

Rewrite so the subject can be y in the formula d=m-y/y+n

What is the slope of (0,32) and (100,212)

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?