Question

One week, 100 students purchased items from the student store and the store made a profit of $500. The next week, when 80 students purchased items, the profit was $460. Write a linear equation relating profit, to the number of students, .

Answer 1

y = 2x + 300

Explanation:

(100, 500), (80, 460)

y = mx + b

m = (500 - 460)/(100 - 80) = 40/20 = 2

y = 2x + b

500 = 2(100) + b

b = 300

y = 2x + 300