What name is given to sequences that have a common difference?

1. Some sequences grow by a fixed step and others do not. 2. Sequences with a common difference are called linear sequences. 3. Their general formula is built from the common difference and a constant. 4. That common difference always turns out to be the coefficient of the position number. _Source: Siyavula Mathematics Grade 10 (Everything Maths, CC BY 4.0), Chapter 3: Number patterns_