Slove for x

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

The graph of h(x)= |x-10| +6 is shown. on which interval is this graph increasing

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined