Question

After one day, 1000 copies of a CD are sold. Each of the following days, 100 more copies are sold,

Write an equation in point-sigpe form to model the sales
volume of the CD. Then use your equation to determine
how many copies will be sold after 20 days.

Answer 1

Equation:

`y - 1000 = 100(x - 1)`

2900 CDs will be sold after 20 days.

Explanation:

See image.