# How do you write a rule for the nth term of the arithmetic sequence #a_11=29, a_20=101#?

##### 1 Answer

Aug 19, 2017

#### Explanation:

Let set up two equation base on the information that given

Now we got:

We can solve this by using elimination method

So we need to multiply either equation to isolate

Add vertically

Now substitute d into either equation that we set up to find

The rule for an Arithmetic Sequence is