Question

A person's score on a Mad Minute is proportional to the amount of questions he or she answers correctly. Each Mad Minute lasts the same amount of time. On her first test, Rachel earned a score of 70 when she answered 25 questions correctly. Rachel says this relationship can be modeled with an equation.

Answer 1

s = 2.8y

Explanation:

Score is proportional to the amount of correctly answered question :

Given that:

Score earned by Rachael = s =70

Number of correctly answered question = y = 25

Hence,

Score α number of correctly answered question

s = ky

70 = 25k

k = 70/25

k = 2.8

Hence, one correct answer gives 2.8

Hence,

Score obtained = 2.8 * number of questions answered correctly

s = 2.8y