On a set of steps, the first step from the base of the steps is labeled 111, the second is labeled 222, and so on. Each step has the same height. The table below shows the step number and step's height from the base of the steps.
Step number Height from the base (meters)
50 10
90 18
110 22
Write an equation to describe the relationship between nnn, the step number, and hhh, the height from the base.