-5/12 x 8/13 easy fraction please help

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

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?

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?