Question

Tanvi is on vacation at Gull Lake. To keep in touch, she decides to send 3 postcards each day.

Write an equation that shows the relationship between the number of days Tanvi has been on vacation, x, and the total number of postcards she has sent, y.

Answer 1

Note:
1. The more days , the more [cumulative] number of cards
2. Number of cards is directly proportional to number of days

==> 3x α Y
==> 3x=Y