Charlie and Steven are tracking the number of kilometers they bike. Charlie had already biked 10 km, and continued biking 5 km per day. Steven had already biked 5 km, and continued biking 10 km per day.

Question

Write an equation that represents y, the total number of kilometers Charlie has biked after x days.

Answer 1

To represent the total number of kilometers Charlie has biked after \( x \) days, we can set up an equation based on his initial distance and his daily biking rate.

Charlie started with an initial distance of 10 km and bikes an additional 5 km each day. Therefore, the total distance \( y \) that Charlie has biked after \( x \) days can be expressed as:

\[ y = 10 + 5x \]

Here, \( y \) is the total kilometers Charlie has biked, \( 10 \) is his initial distance, \( 5 \) is the distance he bikes per day, and \( x \) is the number of days.