Ricardo visits different states every summer. This summer, he started with 3 states already visited and visits 6 states per day.

Write an equation to model this situation (use
d for days and s for states).

3 + 6d = s

To model this situation, we can use the equation:

s = 3 + 6d

where s represents the total number of states visited and d represents the number of days Ricardo has been traveling. The initial value of 3 represents the states Ricardo had already visited before the summer, and the constant rate of 6 states per day represents the number of states he visits each day.